Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8e8060785f00213…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 00:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 171e958ddf0ad7e231b30c82b300d230 SHA-1: 8a4adae09ae2bd86a1c412d2c905017d2cd84404 SHA-256: e8e8060785f00213155460bd2e00b32415930a649099f4da02c02cb2cee53acc
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing attempt. The 'SE_CALLBACK_LURE' heuristic indicates the document may be designed to trick users into calling a fraudulent support number. While no scripts were explicitly extracted, the presence of numerous external URLs and the ML classifier's high confidence score suggest malicious intent, likely to redirect users to malicious sites or initiate further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://synerhu.ru/uplcv?utm_term=maryland+commercial+driver+license+manual PDF link annotation
    • http://bygreenpure.com/userfiles/file/robeputuwonadaroxivozexa.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16072eed2ba698---lixal.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160af95085dfaa---bepamurojola.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/370697119d815925f6b78c49a7cfbb76/gosorotasozagililoxebi.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/nusokufoxikofoxatamowur.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/vuronalujadonagunukisovu.pdfIn PDF document text
    • http://velapower.com/glwh/UploadFile/file/2021090103474973499.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607daf28522e2---11612529454.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/38661879164.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/36348660307.pdfIn PDF document text
    • http://neodermclinic.com/file_media/file_image/file/tuxifasafe.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/jemaxunipekikit.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/niwesuzufivuvetiputeviw.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/kg34hs50kvgtajr10rnfqc6614/26846321007.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/vobujufoveketegurotajes.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a0j5fhq8qbhmnnlrvhuqajap76/birexigesejipolakufubeseg.pdfIn PDF document text
    • http://efeotokiralama.com/Upload/file/99011632888.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/02c4a158c16fd5cecaa144895bf379e9/vametuse.pdfIn PDF document text
    • http://lempreintedubois.fr/userfiles/lempreintedubois.fr/file/78256745572.pdfIn PDF document text
    • https://flexi-cms.com/uploads/file/suxuzavubumu.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/kowupasuwazowazepamifix.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/16078e230a31b0---mijixaxilububogudimob.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/93113040243.pdfIn PDF document text
    • 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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 16836 bytes
SHA-256: a0c9dd17d09598fa1a478f3339629717d35e6bb0108396e57a3aad25e4a052d0
font_01_sfnt_off000109d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D8 10704 bytes
SHA-256: 2a81c975047ca2b1519ba1f784a3e14f6d9d85465d93a9d642b1362365968ac7
font_02_sfnt_off00012266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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