Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9cbec1cb0abd37c…

MALICIOUS

PDF

98.2 KB Created: 2021-07-19 03:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: da9fabafe6cfc196b7e7caac49747e9b SHA-1: e1d9c264b840b44d961c133c188a654b52a7622d SHA-256: c9cbec1cb0abd37cbddb892fc8e6db0c2ba47cba3435905c751a1f25763cecf6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress upload directories and disposable hosting, indicating a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9800

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://stalbeckers.nl/userfiles/image/file/popadozaxufosofukibuzavil.pdf In PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/jl8psm65hp18fb1sk6oh6mevbf/63091712970.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/3161229970.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/iuoe6gn2fdi6cdbmdd37pjfpiq/6487562319.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/19804856314.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/aa3a655c95ca212d50962a574ccea324/kikabav.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/37010252350.pdfIn PDF document text
    • http://abpaluso.com/upload/file/26101825119.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/46382559463.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/01267fe332ab66647d9bdcca856a59e0/zinusopize.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcc9e18334---27350203714.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607acdd3396c7---niwujomotum.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/v8pi3pqmdhs2qchnr2hg38nv6s/29316060269.pdfIn PDF document text
    • http://one9five.com/userfiles/files/79803591865.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c1120651---88476606424.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/29185415469.pdfIn PDF document text
    • http://tumonjfk2020reunion.org/clients/f/fe/fe8b949e9fe7e5065ccade199761aacb/File/wofenifevisinuzafalilu.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/3eee9ebab261eec022ad82ea7621366e/44952316975.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c087a2299a1---23484640816.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/52484d1da82bc216f59dd76f394f179b/kotifovomatosonunazalodi.pdfIn PDF document text
    • https://wittnebel.dk/file/69807132964.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c2c05f448---59745925890.pdfIn PDF document text
    • http://maslag.eu/userfiles/file/tefawadudedaxewejokem.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bc72ece755---xakurewosanejibon.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/13cec60d99c6cb63ff44557cf620e4b8/83968607077.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/koremelizonisasexiselaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=example+of+non+benzenoid+compoundsPDF 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_off00011a19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A19 18184 bytes
SHA-256: 66224fdc408bf2f65075c6d4a1fb01debb6e0651e3b4aa497a62e9dad55d421b
font_01_sfnt_off00014891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14891 10968 bytes
SHA-256: 913ffc1dae0d2f2ec4430f7df5a66c5e1dbe6976a89d1a4e6fd7e3bb3ceed7ab
font_02_sfnt_off000161c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1