Malicious PDF — malware analysis report

Static analysis result for SHA-256 be6010a079cb8bfa…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 04:51:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 23b7f9a61de99579edddb46cfdafd9c7 SHA-1: b443072c3586bf36815dfcf86a9a6d8d931f6a3b SHA-256: be6010a079cb8bfa4884d981732bda7fdcdc08a14f26a4c3ad406e98c248c686
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient for a high-confidence assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://crewmak.ru/uplcv?utm_term=control+and+coordination+class+10+test+paper+pdf
    • http://asfalon.com/__files/file/39470776154.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4867668ced---fefamokujuxifu.pdf
    • http://used-machinetools.ro/app/webroot/files/userfiles/files/2116203803.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6bd7bb80---siwudamumoma.pdf
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/193b1d4ed0d576e95e106fdf85fa2e97/58514014056.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c5eb9782c739c1563c1dbdeeca6e1881/gomafiwejojolurimi.pdf
    • https://holocaustresearch.pl/nowy/photo/file/57399695499.pdf
    • http://jarosi.hu/files/file/58241265909.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2118232d10---xixox.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b66f9dc711---pexej.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0a60c4293---mevadabaxelazinolafamez.pdf
    • https://ideylia.fr/uploads/file/wuzebidajarerimonasomab.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/68c731e076a07a0a37de6dddbc29ed5a/20650175733.pdf
    • https://itchanoi.vn/uploads/news_file/toselijonimezik.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1609486456e29a---68339422817.pdf
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609de5ff3fced---bepemaputunaxedesuzave.pdf
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b4018d9d5a---wilam.pdf
    • http://capitalclassof1971.com/clients/4/4c/4c1e4f015ba9b8bec237dc1ca705466d/File/sefuxofuwifevozofotonu.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20fdff0db6---fupaduxi.pdf
    • http://elsekmont.eu/userfiles/file/rinewowufemorumugipi.pdf
    • http://voszveszprem.hu/_user/file/sezepotiko.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/07tilpmdmj3gn3d856nrghrab9/80076656254.pdf
    • https://theatresaucinema.fr/uploads/file/8576636582.pdf
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cce91a05acb---41280596576.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001061a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1061A 16792 bytes
font_01_sfnt_off00011e31.bin
da42e83400ddf54c580a937fd7df009d968c6721e2ffa9103becf2057e9decd1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11E31 10820 bytes
font_02_sfnt_off0001374e.bin
72e427ef7d93bd6adb4e8f4dac7874677a40824d466cea3d185b8b3904c3dfd2
pdf-font-stream PDF embedded font (sfnt) at offset 0x1374E 16556 bytes