Malicious PDF — malware analysis report

Static analysis result for SHA-256 3877a7a3cd1e7edc…

MALICIOUS

PDF

103.1 KB Created: 2021-06-29 07:05:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e2e2437b7e1b49855146c6f50a616e27 SHA-1: 942fa98ad352dbc287bdeb0fe2769d06cb3e4eed SHA-256: 3877a7a3cd1e7edc5c31a89906b969267a9b00358423647f9b75db310f12c177
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL patterns are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9773

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 https://oniceh.ru/uplcv?utm_term=hypodense+lesion+in+brain+ct+scan PDF link annotation
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/36ea2f014b64e9152ffc3c1220147890/bozejamedorekevivojikowi.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/dd9a35954deaf993a895c0403ac0cf54/63058896689.pdfIn PDF document text
    • http://apogeeconsultancy.com/upload/files/9922921618.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/skftv995fjrgjk4usaeij47udm/jesifobomeburigefaseni.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/sewikajawobetem.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/eb28431a63f9d9d6d0645c76023b933c/sezaz.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607add301e70a---xixafamoxubunebazasow.pdfIn PDF document text
    • https://investmentskillsgroup.com/images/userfiles/file/74379904933.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16074bae3812d3---sefemolubiwunimuv.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084bac4953b4---sofewubikibutoga.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ff7828080f68e013ff395567ec9d266a/ruzalazalunirafoped.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607e33624fc87---dowiroruxetizadeg.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608aea47076e5---rezigur.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5ca4cb7244---44051761631.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d5bca8995db1fb3a69355ed1581c1314/bagibesanibomejo.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a17bdc64936---69579002158.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/toteseki.pdfIn PDF document text
    • http://klimatyzacjaradom.pl/userfiles/file/lusinawovidiwe.pdfIn PDF document text
    • http://www.deopendeur.org/imgUser/file/30288430226.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/bdffc81734e1a652c3a0fd8eedd685df/bisawozubatiloziworase.pdfIn PDF document text
    • https://energooptima.hu/upload/File/33911296909.pdfIn PDF document text
    • http://pogotowienaukowe.com/Upload/file/kiwiwof.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/n5tsedrpq1khdmcqq5qvbu0eq7/gifozosasu.pdfIn PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/jupefolafurofikemim.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608beae0a4012---13631032669.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2578f78e150a8e9cc23dc20257f25d8d/82228820197.pdfIn PDF document text
    • http://hoteldazegliotorino.com/userfiles/files/sukepomo.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/gjpfr6ruhaus9thj01b4hilnco/94468260911.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_off0001320e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320E 10752 bytes
SHA-256: 783fe72293e21812dd6b5c02c4a52f7c9e846217b74660afbb32741da774b586
font_01_sfnt_off00014aa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA5 16856 bytes
SHA-256: c728fe68e14217c00070c2d0935e1795ca19867b4d5089dc863db24540643b87
font_02_sfnt_off000176a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x176A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1