Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7f43ab47aa3e177…

MALICIOUS

PDF

83.0 KB Created: 2021-10-09 20:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 38cc8ddee556deff589340d2f6aa5910 SHA-1: 7015da005dbf2d6e6edc399970b694648276c344 SHA-256: f7f43ab47aa3e17737bb28d1dd702aff5be49ad62608d2021732b28419bdd5de
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting a phishing or malware distribution lure. The embedded URLs and the nature of the heuristics strongly suggest this PDF is intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161565dc427dec---pobimomemoxibapule.pdf In PDF document text
    • http://www.pibmg.com.br/ckfinder/userfiles/files/files/34803662572.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/55636727722.pdfIn PDF document text
    • https://tranthachcaodanang.thicongmaiche.com/uploads/image/files/nupozilu.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/253387254.pdfIn PDF document text
    • http://www.jfac.kr/ckfinder/userfiles/files/30786559860.pdfIn PDF document text
    • http://crystal-lamp.ru/uploads/files/35511679709.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/wusexobav.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/40184544941.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/mimumagupekufuzazike.pdfIn PDF document text
    • https://manhalhealing.com/userfiles/file/30472993687.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/16703427305.pdfIn PDF document text
    • https://resicolor.com/upload/files/dexovevifibu.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613184acaab5c---19441660707.pdfIn PDF document text
    • https://stvorki.ru/files/file/masejumo.pdfIn PDF document text
    • https://ceccarmaramures.ro/userfiles/file/69815068410.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/50562860928.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/mipugom.pdfIn PDF document text
    • https://vrrc.heart.net.tw/ckfinder/ckfiles/files/gugosonowoxewejuxome.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/bavitoruwatesaz.pdfIn PDF document text
    • https://campermagazine.tv/public/file/98128532100.pdfIn PDF document text
    • http://www.poliklinika-hb.cz/userfiles/file/seposab.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/difuduzidaf.pdfIn PDF document text
    • http://boras-sjuharad.boj.se/uploads/userfiles/files/jajafegeviwije.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/pesebotofagaxukovovupexox.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/f6932919563454108d2b62c34a608f54/88346870631.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=prominent+bile+duct+meaningPDF 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_off0000d90e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF120 20320 bytes
SHA-256: 1e69a01144fd508ec15e4e5ab3cb2a7b5e9426d7fc63a100c6c04d6228e605c1
font_02_sfnt_off000125f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125F2 10784 bytes
SHA-256: 0438d273c02c5fd8cc33d770015f5ae7e4f416a1a23d16695aa1cc4d43828662

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