Malicious PDF — malware analysis report

Static analysis result for SHA-256 f756470ed4ffa7f8…

MALICIOUS

PDF

118.3 KB Created: 2021-07-30 18:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 65d9a93f0e468a60c2586c966dbd3bd8 SHA-1: d68b7542a105086ad1b4b99f858f7f51d1b1d7c5 SHA-256: f756470ed4ffa7f8fde8072d6b44d47c001d54ee6f9d89159d26ed0d9841c128
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to potentially compromised or disposable hosting, suggesting an attempt to manipulate search engine results or direct users to malicious content. The file's structure and the presence of multiple links indicate a phishing or SEO poisoning attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://esipro.fr/userfiles/file/58810062848.pdf In PDF document text
    • http://cwesp.biz/upload/file/xawuzusivuxazodam.pdfIn PDF document text
    • http://debden.org/userfiles/file/tetigamijofudukude.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/05f6k17921mmv0g3nl4l6ks9ij/pilutogexivowovusijopogis.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/nujarafojiguditepepir.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608166e1ba5be---99284616321.pdfIn PDF document text
    • http://djennebeads.com/nbloom/fckuploads/file/besaru.pdfIn PDF document text
    • https://windsbs.biz/files/file/5961524059.pdfIn PDF document text
    • http://safires.cz/ckfinder/userfiles/files/beraginutug.pdfIn PDF document text
    • http://geometramaurotozzi.it/userfiles/files/76621035176.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160834044120e5---61198587627.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076de7231de0---nubemukunipulabit.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a1016886c5f74a06535d6dd05fb74c5a/49635721472.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/lisifugarizowi.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/93681314917.pdfIn PDF document text
    • http://meteosputnik.ru/userfiles/file/45749097124.pdfIn PDF document text
    • https://gtnet-engine.com/ckfinder/userfiles/files/9861768306.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160882384ce2ac---faxolepaloputug.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/1685353a62c977a69e58d1e978b8d233/93473032306.pdfIn PDF document text
    • http://transfertrolley.cn/d/files/xibixunenemala.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/mojisevipakumexa.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4671096301---8678494673.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/28855189420.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/2e15e45b6dc179cbff778df574297035/xajaxito.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=como+hacer+ropa+para+mu%C3%B1ecas+grandes+f%C3%A1cil+y+rapidoPDF 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_off00016a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A9B 16880 bytes
SHA-256: ff5a14cc87e2f4b46d99d0f8b26349943753ce1bd0e01e6313f70de30e400f0a
font_01_sfnt_off000194fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x194FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001ad14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AD14 11600 bytes
SHA-256: a91b25d7caa42d1609250e1e0d6672c49ea5da4d4e45c6ddde1d087e3889e170