Malicious PDF — malware analysis report

Static analysis result for SHA-256 555e3781d7417037…

MALICIOUS

PDF

79.1 KB Created: 2021-09-02 18:16:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 22197362109fbf32bd915cb6d0e39da9 SHA-1: 9b5df024921c5cbd8d3e65fa1cd7750fd208a99b SHA-256: 555e3781d7417037a5ab8aa840808f5ce17020d81c79591ec410e34c19d6c3ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of urgency lures further supports a phishing or scam attempt. While no scripts were directly extracted, the PDF structure and heuristic firings indicate it's designed to lead users to malicious content, likely a phishing page or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://gifarlcm.com/upfiles/editor/files/dexamu.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/ebesm65sqqitub23c1adaood8p/goramurixaxepidajadajaxo.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab77aef1dd---66233462892.pdfIn PDF document text
    • https://olgunbey.com/upload/ckfinder/files/fajulore.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/regawiforoweworevilijol.pdfIn PDF document text
    • http://schoonhovensvrouwenkoor.nl/ckfinder/userfiles/files/46643129381.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160be831063934---dezasigabelijamilagada.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/16089838729845---mokubifomusef.pdfIn PDF document text
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e0884eb4168---puwetog.pdfIn PDF document text
    • http://boekenwinkelindex.nl/images/uploads/47780133355.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/i80e36rarffqc6h3421qc07l2l/36449657096.pdfIn PDF document text
    • http://surtek.biz/image/files/20150114_132521.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/46665870947.pdfIn PDF document text
    • http://yuhongzg.com/d/files/wijevukovomolegudopajazul.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/e8133febe216e946e18dc0865e1748cb/63272485570.pdfIn PDF document text
    • http://accronline.com/userfiles/file/texuf.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe7714b18---21039906173.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/63vv1qigebhvl3kfmhp4ias3es/depegizif.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160e052c6a6c46---93187028261.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16088671f6b06b---56912719605.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/8724154073.pdfIn PDF document text
    • https://basalyemek.com/ckfinder/userfiles/files/25556630564.pdfIn PDF document text
    • http://sushibelovo.ru/files/jedukiwojub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=cure+for+hiv+and+aids+pdfPDF 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_off0000d326.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD326 16664 bytes
SHA-256: 53d6ed12dd58bc4d09efde9d1cc5ded2d5788627ece2195fbabae9cc9e567dc5
font_01_sfnt_off0000fe9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9F 10648 bytes
SHA-256: 171c66fe0b1ac1767c54df4939014f7fe00ac229a5d7b782f5df99cb67adfd12
font_02_sfnt_off000116ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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