Malicious PDF — malware analysis report

Static analysis result for SHA-256 145e2fe0c98b44c5…

MALICIOUS

PDF

85.3 KB Created: 2021-09-13 07:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3dc11a21f28d1113304e2b2694bc05a0 SHA-1: 52675f2bbfdb2487c05ecc96102e669e6df2bb87 SHA-256: 145e2fe0c98b44c5065f11c003f5f2996f1ebd3563baf2489794b618f165a233
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, indicating an attempt to distribute malicious content or phish users. The primary goal appears to be redirecting users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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://hasanmasat.com/ckfinder/userfiles/files/89045022536.pdf
    • http://prosefkuchare.cz/userfiles/14487456243.pdf
    • https://jagamimpi.org/contents/files/11432012676.pdf
    • http://bajajsports.com/userfiles/file/paxunosiwanuwarowuxe.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613850e229380---68414402253.pdf
    • http://likebarcode.com/image/files/20210903_195729.pdf
    • http://www.findvoters.com/userfiles/file/30582175014.pdf
    • http://resurrection-life.net/userfiles/files/68094807049.pdf
    • http://ttmplus.com/userfiles/files/62546716376.pdf
    • https://igk-lilienthal.de/downloads/328952856.pdf
    • http://hoachattn.com/image/files/ruzasepodazuborawanij.pdf
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613743dc89e2b---saramevup.pdf
    • http://heatherjansch.com/ckfinder/userfiles/files/48847214289.pdf
    • https://smobiil.eu/userfiles/files/rererorotajejinole.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/955c37e9d895f68f924778c38df4d9e3/75185720884.pdf
    • https://xedulichhaiphong.vn/images/news/files/71651569613.pdf
    • http://nacyc.jp/Upload/file/nemusojudunutevek.pdf
    • http://lighthouse-connection.at/myPix/file/xatowifituke.pdf
    • http://kusistoconstruction.com/userfiles/file/tulutabe.pdf
    • http://midesignvn.com/uploads/files/pobogoxefuturojiwidexagif.pdf
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/80118234d07cdaa0a98cd06864e9868a/69550365762.pdf
    • http://dush-kz.ru/uploads/fck/file/73613039637.pdf
    • http://theleadershipworks.com/PO2/UPFILE/userfiles/files/17131274233.pdf
    • https://www.iieng.org/editor/ckfinder/userfiles/files/bamugop.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=storage+folder+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e98f.bin
4ed06d34838622d7abf29345a1c2caf78b33f590868ac664d948f4eb0317afdc
pdf-font-stream PDF embedded font (sfnt) at offset 0xE98F 10436 bytes
font_01_sfnt_off00010119.bin
460eccd8be4ed3fca4a616d17cde38e7f3a81314d35f24135f0dd18dc303a1af
pdf-font-stream PDF embedded font (sfnt) at offset 0x10119 17860 bytes
font_02_sfnt_off00013006.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13006 16792 bytes