Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc0495b91f4969ff…

MALICIOUS

PDF

99.2 KB Created: 2021-10-24 05:43:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 20da7a376119a75b4e0817fd6130658e SHA-1: 748a2c48738f81f316d1e983b12962a732665aea SHA-256: cc0495b91f4969ffb7b7a4eac4ab3371b2046d374b8dec83a7158dcdc109553a
136 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to trick users into downloading further malicious content. The ML classifier strongly indicates maliciousness, and the presence of multiple PDF_RANDOM_URL_LINK and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16156d19d6b702---pepatedapemojusadunimu.pdf In PDF document text
    • https://nada70.org/userfiles/file/76347380673.pdfIn PDF document text
    • http://szwygs.com/upload/lexasikapibakolulufabi.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16170439396d64---pologe.pdfIn PDF document text
    • http://abnicum.ru/files/file/40293124448.pdfIn PDF document text
    • http://secondhandgraphics.com/usrfiles/file/najiji.pdfIn PDF document text
    • http://kientrucsangtrong.com/plus/files/83107851401.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/50413948296.pdfIn PDF document text
    • http://gibisch.info/files/files/saketogovaxojij.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16167c6ed97383---84385143446.pdfIn PDF document text
    • http://papienbanana.com/user_file/file/setidurenimudegi.pdfIn PDF document text
    • http://goldendoodlesofthesierranevadas.com/userfiles/file/45054736858.pdfIn PDF document text
    • https://volandovia.it/public/fileeditor/file/momabawidu.pdfIn PDF document text
    • http://christopherspubandgrille.com/userfiles/files/66188655395.pdfIn PDF document text
    • http://maychebiengoduykhuong.com/media/ftp/file/setupu.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/25617869792.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/74666151889.pdfIn PDF document text
    • http://www.grifin.sk/files/97260732973.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/webazasuwireruzomipuwijox.pdfIn PDF document text
    • http://xn----itbbfrdrdbd4bgy6gi.xn--p1ai/webroot/files/files/vudones.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/31687986740.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/lurime.pdfIn PDF document text
    • http://xn--299a941ap1h.com/userfiles/file/20211008054550.pdfIn PDF document text
    • http://status.cz/UserFiles/File/43657256145.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/D9plVHj2VOU/uplcv?utm_term=g+is+what+number+in+the+alphabetPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001077f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1077F 10760 bytes
SHA-256: 0fe912a6335c3fbebe8c09c4fd7016defd218a3a2d99bc72b95dcf63593f23f1
font_01_sfnt_off00011fe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000137f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F5 1728 bytes
SHA-256: 57eddfd20a5532195ef8c259040b6dab99543ee885f86974fd3d8428f697fd68
font_03_sfnt_off00014014.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14014 24228 bytes
SHA-256: 34128062164f0afd558e936c420bd21f850aaf9aecacb8be10d7374da2f8850d

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