Malicious PDF — malware analysis report

Static analysis result for SHA-256 78cd744fb1f2ecc3…

MALICIOUS

PDF

82.2 KB Created: 2021-09-06 11:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a6c6bce2015282848f2c337f7b32ab86 SHA-1: a83f2650870ea0ff19e18e3c4c4c985a352be114 SHA-256: 78cd744fb1f2ecc353ee24f9771ec10b1a64b04788f77752b32a09cce93511ec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload directories. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to lure users to download further malware or engage in phishing activities. The presence of a 'download button' heuristic further supports this. No scripts were extracted, and the document body was unreadable, but the link farm structure and external hosting on compromised sites are sufficient indicators.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160d00f1f42046---vudolozusisimokizujimim.pdf In PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160851de095c85---rewedefosadusof.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16074bab6b688e---xomumagalorululejugirijof.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/femalakesedizewuzop.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9b1147e6c2503c60a66d6310512c68e5/bofivozuxevafenuzidozuw.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/c3lr7cqla6cpqv9vrc2724v81s/39454061918.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607978b3407f4---bilegutizavufurebiziwit.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/epqcmh7fmgmcqo2rels3ui7huf/29710765052.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160941237453c3---ximipegakojajovexam.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/14959846854.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91c7c8e13---rerikerewalinuz.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa984e6531---rapobogek.pdfIn PDF document text
    • http://archerelectricsupply.com/userfiles/file/45907673927.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/legifasiledisumepomulafov.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/kidupejufofot.pdfIn PDF document text
    • http://hengtongrongshang.com/jingkelun/userfiles/files/20210731200653.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ed9d8122a10---21480457991.pdfIn PDF document text
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/6dd03fa631ab9e355e95094126e8fd55/33244940137.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/16092f9991117f---77744422898.pdfIn PDF document text
    • http://remaining-mc.de/userfiles/file/fidarafudosumijaxes.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1607c11bca852a---55471982835.pdfIn PDF document text
    • http://icloudcleaners.com/uploads/account/autoresponderfiles/77083521316.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/c045b265c6a520bb1496416e772134a1/kikota.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/zizurujelijojikabiva.pdfIn PDF document text
    • http://sql110.com/pic/66527831365.pdfIn PDF document text
    • http://aroma--style.net/files/files/11759952135.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=icwai+foundation+books+pdfPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/tuxifovagodutopuvi.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD47 17360 bytes
SHA-256: 8158a294a0a53cd93afd80c1862d488a32518eabcf554904b06daa4e23f54381
font_01_sfnt_off00010a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001227e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227E 10704 bytes
SHA-256: 96abc58dc5f962a5776214a5c15786b6fec782b13c4a2f2b7b1b274c8c328f67

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