Malicious PDF — malware analysis report

Static analysis result for SHA-256 f700e677f6338a10…

MALICIOUS

PDF

75.1 KB Created: 2021-09-17 01:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3d86de7d8d1cb93aec5201188b289026 SHA-1: d897598c8a0f6c85d137a30588393fad13ed7adc SHA-256: f700e677f6338a109aee10a398e096055802c5bca4aa5f4addb364cde0607de5
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability for client execution. It contains a link farm pointing to multiple domains, some of which are hosted on compromised WordPress sites, suggesting a phishing or malware distribution attempt. The presence of external URIs and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142b80401ce2---rotugezuremenokigega.pdf In PDF document text
    • http://ihdbd.org/upload/files/11879275228.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0c92ba8b---lewog.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/bovibaposigujepalugikumuf.pdfIn PDF document text
    • http://unseretochter.ch/images/file/28433949794.pdfIn PDF document text
    • http://erpos.sk/data/files/48432988861.pdfIn PDF document text
    • http://rracc.com/file_media/file_image/file/35962546520.pdfIn PDF document text
    • http://zhuoxinlaw.com/userfiles/file/20210915161227_716951771.pdfIn PDF document text
    • http://ajk-opakowania.eu/upload/fck/file/15608551833.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/44287088951.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/gozazatefisumagidudosuboj.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/bakefotibodokuwurigomatip.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/lugibiwu.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ec46ed10c0---94126792384.pdfIn PDF document text
    • http://sksound.com/userfiles/file/50925814052.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/sifoxutakemaxofuwubogu.pdfIn PDF document text
    • https://etadelloro.it/images/file/juvevobadaxavudo.pdfIn PDF document text
    • http://melz-feu.ru/upload/fujelobozexifapelimo.pdfIn PDF document text
    • http://pscworld.eu/ckfinder/userfiles/files/fokipebosenugivozeta.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/68154823898.pdfIn PDF document text
    • https://appvid.eus/userfiles/files/57159640596.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/lawupifuvenozalu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=the+archers+2+apk+modPDF 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_off0000c1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A5 17392 bytes
SHA-256: 20a26b3e6c7acb5ffa3be100cdd72f1f00b8b6f05b9439aee49c2205700244d8
font_01_sfnt_off0000ee5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 10612 bytes
SHA-256: 24ada8a20cbef8f2515b1bdbb4e7aaad96f65c9a253a0eeb7c3c89e8c0403454
font_02_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1