Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a40c129769bd430…

MALICIOUS

PDF

89.4 KB Created: 2021-08-22 05:14:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a9c28e099f1f9a721dc4a60ee370355 SHA-1: cc793ee2bc99e1edf81b781860cbc117fd8336d0 SHA-256: 0a40c129769bd430667b87c1fb3bf4b42d565b24828f578469b6c67b4d2aeb66
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting an attempt to redirect users to malicious sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://abofahed.com/userfiles/file/15822401308.pdf In PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/fegeger.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/78936775256.pdfIn PDF document text
    • http://tsmsaldature.it/userfiles/files/dilixemujufemegemeter.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608912c0858bb---97179688523.pdfIn PDF document text
    • https://lacaune.hu/userfiles/file/pinerozuxikedebugazov.pdfIn PDF document text
    • https://pensiuneavalentina.ro/app/webroot/file/24519486434.pdfIn PDF document text
    • http://stevis.cz/files/file/badigifepopopateturex.pdfIn PDF document text
    • https://digicpictures.com/downloads/9318705747.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c0f10827d53---44625048736.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/xixazowezen.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a6eef881ffb---xaxalibafiwenupitofapas.pdfIn PDF document text
    • https://ms01bet.net/contents//files/16586805440.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/nekebudo.pdfIn PDF document text
    • https://pasarantogeldua.com/contents//files/15464267654.pdfIn PDF document text
    • https://aeap.com.br/ckfinder/userfiles/files/22795903499.pdfIn PDF document text
    • http://jcaf.or.kr/ckfinder/userfiles/files/72150827065.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/tfgmm08884nsiv4tbo69m98v92/kidom.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd60896f25e---66768493699.pdfIn PDF document text
    • https://sharzh-ufa.ru/wp-content/plugins/super-forms/uploads/php/files/efa4b2d2677dec534a512c1dd84ed243/jatadivedurobuwoli.pdfIn PDF document text
    • https://booknowrentalimo.ch/userfiles/files/2588042816.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160894c5fa572a---44353256392.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4e362a4d3---45210564451.pdfIn PDF document text
    • https://essaidafm.com/uploads/FCK_files/file/nigedemoxipiku.pdfIn PDF document text
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609040488fc79---2474072017.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=inside+job+video+questions+answer+keyPDF 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_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 16460 bytes
SHA-256: d88862b18f747667dad03b44f4890c0029aff5e1732595aa14e25ee98d429a0c
font_01_sfnt_off000124d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124D3 11020 bytes
SHA-256: 4079c80cda574ca30773bc0f7c0b1acf4c32eea5e9d26ef245c0f2aca0105023
font_02_sfnt_off00013e6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E6B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1