Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3cdf1e204e88dae…

MALICIOUS

PDF

91.4 KB Created: 2021-07-21 23:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 521bb2c064a4b407f5fa9a8c96f5cd43 SHA-1: 11f3a5db175a87821b2fc7edd6a13266c23045cd SHA-256: c3cdf1e204e88daea3918651713f561d6818775ace634c1d31e6fe62591e7874
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URIs that point to external PDF files hosted on various domains, many of which appear to be compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users into downloading further malicious content or engaging in phishing. The presence of a link farm on disposable hosting and the use of IP address literals in URIs further support a malicious distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://aksusu.com/upload/files/vikafefegobaviposujus.pdf In PDF document text
    • https://lescourailleurs.com/upload/editor/file/jogawitulivelamerejafifuw.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609daf2c8de34---96432642834.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7a55ee205e08be3bbd6d87a0bcda11a7/vebesuxeduvofibefusavon.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/peposalutobanel.pdfIn PDF document text
    • http://halmar.info/userfiles/file/75532118283.pdfIn PDF document text
    • http://www.celso.org/download/98062325619.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d239f8801c---35412514085.pdfIn PDF document text
    • https://lawyerupsmart.com/tempimg/file/45404456779.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/n7rgdvblnkvemllkfq11bot7v7/zogudor.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/615044d8b942d6ce4f7eb88df3d5b27c/fosinotevisejuvan.pdfIn PDF document text
    • http://betaempire.com/uploads/userfiles/file/file/78996314502.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817d1c80404---5740065533.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/2a1466123994c77d01b21cfb1d48ef41/67130021528.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/68490261446.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/1rn2krv6r5ra33ap912335evqf/nefupu.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/faqjqrtl5kst5a1vgg4iplmuph/masawigapalam.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/56724056168.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16089d2c3c2952---30483089337.pdfPDF link annotation
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c87aa76618d---27810764204.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/84905763099.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=sharing+wife+on+beachPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFF 18020 bytes
SHA-256: 9164967ae83a07cbad705fc1e5c657f9832025c63fa1435fd66f6a7cd01eacb1
font_01_sfnt_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014790.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14790 10604 bytes
SHA-256: 428047c1afe17387151540c145b2a1e8f0790792a131da2ea4cd98779a17463d

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