Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7c4fb094a8642e4…

MALICIOUS

PDF

85.8 KB Created: 2021-09-15 11:23:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e645db6aab5a174ea1130bc4bf074c6f SHA-1: e879aeff5f51bdb23e5abec9d1620a2f0f130740 SHA-256: c7c4fb094a8642e49375d34d330513573f1f21b5081314ecb886b2dc2bd8c0ea
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond what is inferred from the URLs and heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://crewmak.ru/uplcv?utm_term=crackle+free+movie+app+for+android
    • http://dkstores.gr/userfiles/file/legibotejedumebe.pdf
    • http://anpo.vn/upload/files/dugud.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/07i3nqtdms768npi16gfgdo4is/95333906992.pdf
    • http://kusistoconstruction.com/userfiles/file/soviliwola.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613342a238ffd---guwufajajif.pdf
    • https://rpdev.org/ckfinder/userfiles/files/39697407835.pdf
    • http://naszemotyle.natura2000.pl/imgturysta/files/32200687635.pdf
    • http://www.plan.msu.ac.th/ckfinder/userfiles/files/ditotepijafuliriwa.pdf
    • https://franchise-vietnam.com/app/webroot/img/files/remawovuxulu.pdf
    • http://ubest.ru/images/file/95737613319.pdf
    • http://szyqjsj.com/UploadFile/file/20210911172619964.pdf
    • https://relans-nn.ru/images/docs/file/sipozofubuwufowimekimoz.pdf
    • http://seamacros.com/upload/file/nilogufasake.pdf
    • https://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fe8aa155a---42156199937.pdf
    • http://kbidc.kr/upload/editor/file/1631520795.pdf
    • http://ngocvietbungalow.com/upload/files/wufajorafawatupi.pdf
    • http://banquat.com/userfiles/files/bilosapuduwev.pdf
    • http://tao-ssct.org/data/upload/file/25245165269.pdf
    • http://hndgyl.com/v15/Upload/file/2021914222364459.pdf
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/72396574242.pdf
    • https://ringid.vn/ckfinder/userfiles/files/83897956792.pdf
    • http://machinesupplier.cn/data/product/file/2021915_152034_252.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec2d.bin
05d63f3c5a2d8e6cccca57c3152dd7a2498721a74b0e73e5db5600ffacc17663		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2D 17624 bytes
font_01_sfnt_off0001197f.bin
4857a8a267f6009a7de955bc792e009558a5bbd21a11c5fadcdd63867592577f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1197F 10704 bytes
font_02_sfnt_off00013207.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13207 16792 bytes

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