Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9aa931252f35b10…

MALICIOUS

PDF

80.1 KB Created: 2021-08-15 16:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6dd543c457aefeaa89df22fcb16ff63f SHA-1: 5fde3f833e20b31af7f3bd0d21ed973501f3083b SHA-256: a9aa931252f35b108ace4279b2065d57610525888a68805c9520412601cd9de4
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a link farm and a lure for phishing or scamming, with several URLs pointing to compromised WordPress installations. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of numerous external URIs and the 'SE_CALLBACK_LURE' heuristic indicate the document's purpose is to redirect the user to malicious sites, likely for credential harvesting or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://irlanc.ru/uplcv?utm_term=what+drinks+to+make+with+crown+apple PDF link annotation
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/u7hi489lh5t7gh581dsjjqhnol/62413477851.pdfIn PDF document text
    • https://seedomoretravel.com/files/files/guvasuvutisapomodavaveti.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/duropomalirinowizix.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/dokulivulez.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad7986e899---55090950552.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/lizutezobo.pdfIn PDF document text
    • http://thallo-food.hu/uploads/ckfinder/userfiles/files/14533314798.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1607869adee06a---xenonugufijixexululoxurug.pdfIn PDF document text
    • http://autodilykanka.cz/cmsimple/images/file/90824742053.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/mitutiwekofikir.pdfIn PDF document text
    • http://baobiachau.com/luutru/files/98734193911.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/99080624101.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608eb129d8ed0---32221409713.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/a2e43975010820d148fa0d6d2668f4ce/degozasalive.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/tlo94h4a5dvu4pt6rgl31ovkv7/64803984204.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160986a0786d4b---bisodogasipafesugamug.pdfIn PDF document text
    • http://gdwtechnology.com/fckeditor/file/16220386129.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/tamajudidaxosadubepin.pdfIn PDF document text
    • https://aglogistics-bo.net/userfiles/file/24770557084.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099b0019f864---71738757948.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_off0000d6c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C8 10948 bytes
SHA-256: 0fb563f1406effc7ea58fa2908691e95f6d53eb7afc35387f930dadd11484c17
font_01_sfnt_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 16012 bytes
SHA-256: 8156e75e7291ca408110df4596c190df5cfe4eb6a983247d57c3ec625b3714d1
font_02_sfnt_off0001195f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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