Malicious PDF — malware analysis report

Static analysis result for SHA-256 977b44fa14d6edb0…

MALICIOUS

PDF

88.4 KB Created: 2021-08-13 20:42:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5b97f604beeae706190e7929c58da24d SHA-1: 7aafe42320765e235389aa5bff3e337161583374 SHA-256: 977b44fa14d6edb00aeb16181e950671766e70915830acfbb1c6a3f4dde41dbc
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains numerous links pointing to various domains, some of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the structure and URL patterns are indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://locktactyuma.com/userfiles/file/43477623511.pdf In PDF document text
    • http://trendymamy.pl/userfiles/file/51133456851.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31660698c2---wewelififumenewiginix.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/mts78ceuqm1uscl9b1b7hicne5/34821496861.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/40db432aadedaa778aa016940de4274a/85709152937.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16106b49bdbd0a---laruvezabobibilinirixiwu.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/gasuxojekupupo.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ccab3a4dd---pidigowok.pdfIn PDF document text
    • https://nada70.org/userfiles/file/zatatetojuvemaguwigi.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/ad71561229b6c366176932572162c64f/14576490264.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/ad62890779a95480a51485b59587dc46/5153489536.pdfIn PDF document text
    • http://sibaco.ru/ckfinder/userfiles/files/fajoxemagogitovavaxedo.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/5f4b9ecfe5b3f4a1e030f2a4c00599a8/zetimuwepaf.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/97904683696.pdfIn PDF document text
    • https://emauto.lv/index/images/up/file/61572301103.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2degg9iub6t83g68864b0m19t3/nimipesi.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/6890902755.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/70732778309.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b7f4f58835b---wuguwazabajeneseb.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dba4c514f9f---44709097478.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/48866043312.pdfIn PDF document text
    • https://bbu.vn/Images_upload/files/dagorutomigaribixubuk.pdfIn PDF document text
    • http://gancza.pl/userfiles/file/34799585162.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/q9tbuorm145k2bkgb8m843hn14/50807434242.pdfIn PDF document text
    • http://suachuabaoduongmaynenkhi.com/img_quanganh/files/wibigivunuzatixesudameve.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/b6c950f6e140c24f2d7c8f218a363bfc/bejifajubewuxejosibisobe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=como+poner+piso+laminado+videoPDF 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_off0000f52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF52A 17428 bytes
SHA-256: b09ee4c86111ef295e9ace1be0226ebe4397426615bd4f73e0a74a2841d4610a
font_01_sfnt_off0001214c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1214C 10552 bytes
SHA-256: ba78252840d1d7ad594ecc5bf7932b4f601d2903f38962b97056429cf8a25eb9
font_02_sfnt_off0001394c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1394C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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