Malicious PDF — malware analysis report

Static analysis result for SHA-256 a905e7ff7f69a864…

MALICIOUS

PDF

77.5 KB Created: 2021-09-06 10:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0a12f8dbd18047c299042d07e4428d71 SHA-1: 233412ed3bcd5ed70b2ed159d8865b653981e397 SHA-256: a905e7ff7f69a864ed23546f2124314399af01c86de9702a44552b11ff6931f7
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lure users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, so the primary attack vector appears to be the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9901

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://crysiq.ru/uplcv?utm_term=algebra+1+inequality+word+problems+worksheet+pdf PDF link annotation
    • http://texmet.pl/userimages/file/5640935103.pdfIn PDF document text
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b11c9c561---53131373844.pdfIn PDF document text
    • https://efsanepin.com/calisma2/files/uploads/39168850064.pdfIn PDF document text
    • https://samngaimarble.com/html_upload/file/pugolemeruponu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/335af1340af26997943981de7877fc68/29037866469.pdfIn PDF document text
    • http://worldnaturalfood.com/image/upload/File/88314573116.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/82nv0os2g7ht2fd3daob9ovalj/sutenomubawuwikasadap.pdfIn PDF document text
    • http://lse.hu/userfiles/file/36692694148.pdfIn PDF document text
    • http://www.agot.pl/upload/file/taxiti.pdfIn PDF document text
    • http://judge1960reunion.com/clients/873273/File/98685538317.pdfIn PDF document text
    • http://vivatbacchus.hu/files/file/7516855203.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a223b165de0---50477365047.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/30795033964.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/51bb81712a32d347201de52e2ac21178/gimuzafidub.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/samumeninorogozijup.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/d17b4ec82d9019e636372937deceedbe/53239308972.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/watanab.pdfIn PDF document text
    • http://yjsyrj.com/userfiles/file/navurowasabaporuxojomose.pdfIn PDF document text
    • https://fedico.ca/upload/editor/file/bilogufuvuxibekijegimij.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/20463954400.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760832d1c9b---xogawipifinopigitenuro.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ac47e1354---sunubegusag.pdfIn PDF document text
    • https://hirurgija.me//files/fumasuzeduj.pdfIn PDF document text
    • http://hagelkonzept.com/userfiles/file/13812244293.pdfIn PDF document text
    • http://irvine.songhakbbq.com/uploads/files/52627291646.pdfIn PDF document text
    • http://jsdarvin.com/files/tumejebirosubagawexasifop.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/pikegugovobilinolem.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_off0000c56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC56B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD82 11656 bytes
SHA-256: b4c1edc4a4a9fef5e9d329c0c59a54516da6a1ac6c7b6ba25bb5f803163fb902
font_02_sfnt_off0000f873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF873 18360 bytes
SHA-256: 96b77a1d68780a74bd9ff2b5939726e2ae02c2496c92932ea5f5b5c883e6bb52

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