Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4e0c05778a6fbef…

MALICIOUS

PDF

81.0 KB Created: 2021-08-28 15:21:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 4ba611a10bd9a5f6327624b41e20bd25 SHA-1: 34804a350f15c6c73b7b1ecdfc3d1ce5b3700ed0 SHA-256: a4e0c05778a6fbeff621933d6b83525118d7d0a37b13c9f05a332a854198419a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains a link farm pointing to compromised CMS upload directories, likely serving as a lure for users to download further malicious content or be redirected to phishing sites. The presence of multiple external URIs and a link farm structure strongly suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 6

  • 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.
  • 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.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/f9kj65kp4vojdu7qgik9mchp0a/2874513284.pdf In PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b479121e606---59058587419.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/porunajim.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/62173917327.pdfIn PDF document text
    • http://verypool.cn/images/upload/File/27803554515.pdfIn PDF document text
    • http://chhsmahs.com/clients/8/83/83f479e57a8bbaec88b4a04d821ef24e/File/90288015702.pdfIn PDF document text
    • http://globalsocialwlefaresummit.com//app/webroot/uploads/ckuploads/files/902351664.pdfIn PDF document text
    • http://sahamit.net/userfiles/file/47506829161.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/baludoxopofalo.pdfIn PDF document text
    • http://delve-cr.com/uploads/80939200773.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b3fb5f22---7167766501.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/sovofibuxik.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/31002712941.pdfIn PDF document text
    • https://langestrand.se/anvandarbilder/204/files/24115867885.pdfIn PDF document text
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/9c440ad82cf63e201f63de6c67be2a07/nibege.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c4dd3399f5---bopatot.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/nifoxudufalipesowejo.pdfIn PDF document text
    • https://successalpha.team/upload/files/19510233004.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/51b1b0eb959a8e9b2dc8d01bd678711c/95875015925.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/182768623.pdfIn PDF document text
    • https://www.borzabadi.com/ckfinder/userfiles/files/mijezusigag.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/41008214075.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4smvgbv0f766bevn9s84c5pm65/38834352736.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/xagonuwasesowi.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/723654eb0fb76f0ccbf3d7fa6d5b0f1d/13488190585.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/786a90e5012b50c52ca4dd2e535508d6/67939873255.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=manual+testing+course+contentsPDF link annotation
    • 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_off0000d917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD917 17632 bytes
SHA-256: 29a902ac6b5eb07848f6b5753ba3959d3b88029d080a5b5e3b1cd748b5e68793
font_01_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ec1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC1 10496 bytes
SHA-256: f974c3ef41f0c408d6013f766de357a9d2e0d3cec4deea548f7ff4a462e222b3