Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9f8027503c7074…

MALICIOUS

PDF

85.0 KB Created: 2021-09-15 11:59:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 352c56c18fe21c4914ec23f20194b306 SHA-1: 61eeaf74504e8f41159ad3b74b135761204fde54 SHA-256: db9f8027503c7074d468509b720f7459940512fa57d2bba016c51e23930f821c
176 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised or disposable hosting. Heuristics indicate it functions as a link farm, with some links leading to potentially malicious content or phishing sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://europartner2.pl/uploads/64567311764.pdf In PDF document text
    • http://aptekainternetowa.net/_mdm_apteki/file/93893742583.pdfIn PDF document text
    • https://www.larche-de-jules.fr/ckfinder/userfiles/files/rabadalezifowudadaboxux.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/riposagidixorujuxobabesub.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/28002048468.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/161416619273d1---9363382490.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/30649361281.pdfPDF link annotation
    • http://refah4ter.info/basefile/hotelrefah4terir/files/20754865386.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613a6c2928cf6---gupokanuj.pdfIn PDF document text
    • http://asja.ua/userfiles/file/97439798951.pdfIn PDF document text
    • http://thamcohoaian.com/webroot/img/files/xokesijuzovonuzav.pdfIn PDF document text
    • http://smcertificationservices.com/userfiles/files/folukebib.pdfIn PDF document text
    • http://metapolar.hu/tmp/13843913444.pdfIn PDF document text
    • https://ariconium.cz/webpagebuilder/ckfinder/userfiles/files/bifobejugezadigufafezus.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/655f9cf891ce01400a47ff272c5413b0/82239471665.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/99008078922.pdfIn PDF document text
    • http://techmechengineers.com/uploads/zerovelozagopoj.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/056c833a392b4064f001eefff2f5613e/bujolexedepabudo.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/64939796964.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/18016810047.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/14372751144.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/73246645405.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/21514969664.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/45943787a69f7af758d11e4e0c5b92ec/75253973843.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/94068795754.pdfIn PDF document text
    • http://12shio5.com/contents/files/mutoxetisiluj.pdfIn PDF document text
    • http://mtt-association.fr/upload/file/5146347964.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=phone+call+history+androidPDF 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_off0000e6e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 10584 bytes
SHA-256: 3f4114028dd69ae7a9c4ad4dc1009ab044ed4ac79e4867a244ccbfc3c94a58d4
font_02_sfnt_off00011719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11719 17916 bytes
SHA-256: e39adacf531bf213e58893020ab283712c7e4796111668417880af32267a8144

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