Malicious PDF — malware analysis report

Static analysis result for SHA-256 044b5a9d65500fb7…

MALICIOUS

PDF

71.5 KB Created: 2021-09-06 09:26:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 26922ac29f28a4b143481ad7d00d5bd4 SHA-1: 78673999d95e5be477c0c363c0df4864c9ba9004 SHA-256: 044b5a9d65500fb723640ce3734e472b3f3efaa460f8085f043a0ac9e783a2a3
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised websites or disposable hosting, indicating a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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.
  • 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 http://thrifty-uy.com/files/others/veraxusuti.pdf In PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/2357854488.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/018a5c3d98d27299d9736a3fb3c4b776/talitagubijof.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/ljoq0m80vvfjfbasengrmhf5p0/xenejobinaveko.pdfIn PDF document text
    • http://essentielles-theater.de/UserFiles/File/panotisozonog.pdfIn PDF document text
    • https://tuabogadoangel.com/wp-content/plugins/super-forms/uploads/php/files/b657fd226b3908cd881388409cc21eef/80804945516.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160f6b64fb7190---94892441271.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202172921512568.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/k3sol1otcb9lf3ivhsu519uon6/rodesolusipibituno.pdfIn PDF document text
    • http://atol-res.pl/uploads/file/39942187099.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/f0b31933b5d9a5d256dc2b063497e2b7/wovewevutumomotivigukel.pdfIn PDF document text
    • https://accounting789.com/ThImg/file/mavetowewoguwalawovadomu.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16086ca42c7b5b---fobaza.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/vepebokavojavofef.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/8411cbff0509af8fa83c92448ba55f24/96460620585.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/87863196146.pdfIn PDF document text
    • https://coop-alternatives.fr/images/images/9996646642.pdfIn PDF document text
    • https://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/e2hvkv47lfqdqj2q1m477vp8cq/wotawomewinazenasowi.pdfIn PDF document text
    • http://newgoodluckcrane.com/admin/uploadfiles/file/10876369461.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/64373922092.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/vilomejuwuva.pdfIn PDF document text
    • https://tonitomov.com/picture/file/nawifulerojuneje.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbcef4a1f1---dudogenasevivakomuw.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4faa72ac6---46766488176.pdfIn PDF document text
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160735011d667b---zugopixobixujaxexuresuwov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=muscle+action+and+joint+activity+worksheet+answersPDF 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_off0000b7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7B4 15228 bytes
SHA-256: c84319246c34328eaed384f5234a939faf7b08ebacbe042a2433906419e63c32
font_01_sfnt_off0000de0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF624 11048 bytes
SHA-256: 36408b7d8dbe141738d4123d4458afd08237fa51bb240c3efe49012567f770f5