Malicious PDF — malware analysis report

Static analysis result for SHA-256 04f86cdec2e96583…

MALICIOUS

PDF

83.7 KB Created: 2021-09-03 23:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b0628a568b3fafd81ebd075905788926 SHA-1: 32674d0cff4d399a0e0d7621c88eadf04f233690 SHA-256: 04f86cdec2e96583d6702cf110cd3cb636171342e7c034a58e985c7e7a97ec8a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple compromised CMS upload links further supports the malicious nature of the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://trellisdundee.com/wp-content/plugins/super-forms/uploads/php/files/6fca7c28d0fb6c681573a0a1edf1fbce/94900301926.pdf In PDF document text
    • http://schokoladenfontaene.de/idata/fegebizuzuluzanod.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a600289675c---25669134600.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/69894059316.pdfIn PDF document text
    • http://antansconstructions.com/ckfinder/userfiles/files/riruvedusudotenodo.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/754b43ps62l71evji55d8s4ekr/jifidivududuzajominazekim.pdfIn PDF document text
    • https://pasationtravellers.com/root/FCKeditor/file/72907027437.pdfIn PDF document text
    • http://trhs64.com/clients/c/cf/cfad56e582d93fa9eda51f2516e23bdb/File/95337725262.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/c167f2b80187954a1f4e0307862549ca/xames.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/4869b8c1a9006b57940f51701c026671/62240142867.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/jokubexetorajizaxukaweki.pdfIn PDF document text
    • http://happy-travel089.com/CKEdit/upload/files/6871818227.pdfIn PDF document text
    • https://kueapem.com/contents/files/rusazunaka.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/4f41d25434e9b785df196f30f40b7af5/zijenatebu.pdfIn PDF document text
    • https://nattasampun.com/upload/files/zizuwavilajirunix.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/44134461696.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3076343a---61446709399.pdfIn PDF document text
    • http://modero.vn/upload/files/limega.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16082eefbb7341---vinijobexufonanil.pdfIn PDF document text
    • http://transchem-tech.com/Uploadfiles/files/97424131213.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=diagnosis+abortus+inkomplit+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_off0000e44d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44D 11040 bytes
SHA-256: a127a2699e6241c1ece6e4d72985e076a137a7af837491205668c755e6f34118
font_01_sfnt_off0000fd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD8C 16844 bytes
SHA-256: f20294fd006adba3f1e86bb271bb9300139d4455b3951437a589b86a8e8d91f5
font_02_sfnt_off00012920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12920 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1