Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fff7c2cc7c338e…

MALICIOUS

PDF

88.8 KB Created: 2021-07-18 15:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cbbb6c0a6205128fc0d58700323feaac SHA-1: fd31e145546c32086151687abb4a907589e7524a SHA-256: 87fff7c2cc7c338e584d9a27cdc512ee2a89ab7f7756ffe0b197b06a22b6b3d9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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 http://aiswaryamatrimonials.com/fck_uploads/file/lirobupivedufupu.pdf
    • http://fkjz.cn/upload/files/2021/07/202107071209215471.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c3d8a13242---saximebadawejagesititedor.pdf
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a0b12131dcd---24365369948.pdf
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/k1h4k0r3tdp4pbk8ef2usidgv4/86510755259.pdf
    • http://gustosandvic.com/ckfinder/userfiles/files/72632721762.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/3eaaf76356b11790c4ab5de2e2f51805/86164629965.pdf
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/parovepevexajuju.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/22e7653c12f904e4026b8db053ed8116/15065093644.pdf
    • http://ahkjt.com/upfile/file/femufawojuniroru.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/crgmbrvjgtgfofk939167ldrhk/jusepuserijuwifonu.pdf
    • https://mahae.hu/files/files/75865780560.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/t8m9sgj2rtfbv3f9hmism6vg51/bigel.pdf
    • http://goldmustang.com/files/files/ximanepojagisukikod.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-5-17/20210517013552895985.pdf
    • http://automotiveenergy.cz/userfiles/file/65414108259.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec827cf4f3---jemovafor.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607983bf2256d---51874928851.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/cmtdnh1f8hm1s630j87i4alit9/99448107608.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7de7c11f7---26086616935.pdf
    • http://iccj.jp/images/uploads/fckeditor/file/toketexusovososafunojag.pdf
    • http://orosweb.hu/ckfinder/userfiles/files/51526930497.pdf
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/vc3hkfrl3j9g3tjrm70k3cp846/64755662395.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/063110608ffc9725da947ef29ca32231/mididaxozaxul.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/3oq714sth7mu1klco7pakmbos9/97626532227.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=theatrical+design+and+production+7th+edition+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee24.bin
af8a4f582bd223f08bf72c96890fc0ea04aebb89f65002efb72c6c1941408490
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE24 11012 bytes
font_01_sfnt_off00010781.bin
e3a1ca7fbcde87b6e2bc585668cff1a50452d2a09c95c546c16e9f90aebd6500
pdf-font-stream PDF embedded font (sfnt) at offset 0x10781 1636 bytes
font_02_sfnt_off00010f52.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 16792 bytes
font_03_sfnt_off00012764.bin
d6b42f8ebd765dd0355ffd8b6815d6d8ae5b56b52e20c2c7b487318de50fc9ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x12764 17312 bytes