Malicious PDF — malware analysis report

Static analysis result for SHA-256 47663f1d39db8b14…

MALICIOUS

PDF

68.5 KB Created: 2021-09-18 08:04:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e99e2ddc46360edd3c646c00910181b9 SHA-1: 2d5d2637237bc2d46dae1a529271b79354ff9c59 SHA-256: 47663f1d39db8b14462be2cbd896185511b1edf9107460af2c7348e1698f4782
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. While no scripts were explicitly extracted, the nature of the embedded URLs and the heuristic firings indicate a phishing or redirection attempt.

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://tccsrl.org/userfiles/files/85946401599.pdf In PDF document text
    • http://www.awakohchang.com/image/upload/File/9186051502.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/pidekanutuwok.pdfIn PDF document text
    • https://maths-pdf.fr/ckfinder/userfiles/files/47032751039.pdfIn PDF document text
    • https://coevent.ru/upload/files/jaxebubokefejopirome.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613776bf72c1d---19618923274.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/wifobamolupi.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/74401655484.pdfIn PDF document text
    • https://chungangroup.com/uploads/files/202109031603569196.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/ziruzolejijakasegoruzu.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/81282656912.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134f43028701---41538933115.pdfIn PDF document text
    • http://spbmedax.ru/sites/default/files/uploads/kapisuluravuweruka.pdfIn PDF document text
    • http://hanifeugur.com/image/files/34914042343.pdfIn PDF document text
    • http://tugrabilgisayar.net/resimler/files/kasugekebewedilerives.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/givasijolajuliwumav.pdfIn PDF document text
    • https://lufty.cz/UserFiles/files/niwavurafaloj.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/guxokoxakikajubizolubat.pdfIn PDF document text
    • http://dynamicyunnan.com/ckfinder/userfiles/files/13202874543.pdfIn PDF document text
    • http://wintec-samu.hu/uploads/files/37421006609.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161302dfc06a5e---49961314500.pdfIn PDF document text
    • http://gzsjlt.cn/userfiles/file/28074760412.pdfIn PDF document text
    • http://myflora888.com/ck_files/files/rezowaroko.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/mexiruvuvitepufopobazet.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=wps+connect+pro+cracked+apkPDF 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_off0000aebe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEBE 14964 bytes
SHA-256: 4baa86d722323beed273d49b2cf3f187a375f0adfd1975d283caf9b8ac1df8af
font_01_sfnt_off0000d4fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 10456 bytes
SHA-256: 1835fb5e18706c7adfa996159d11e9d4615f0598fb9f170c3f23631234f362ac