Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95e1367ae0886e1…

MALICIOUS

PDF

75.2 KB Created: 2021-09-23 09:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2bc5e7ed5f8692e751b595bc3916f463 SHA-1: d43bce082c987ddfe45394efa72b888f582a0249 SHA-256: a95e1367ae0886e188a0a9f2696ad271651d1f89502ac14cea2095e5fd15b8cb
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. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution through these links. The document body is unreadable binary data, but the heuristics and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/13f091047659bd20927e05cdb2052761/kiwediwupulodig.pdf
    • http://drapikowski.pl/uploaded/fck_files/file/xakapupakarejube.pdf
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/96c806e0fb0ea58fac1072feface3034/lamewovelobazuxegu.pdf
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613187b0e829b---tofovaloxoxud.pdf
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/d636d5e1a275a38c8c85a3f6161a7825/mazogokakewopofoniz.pdf
    • http://baobianhkhang.com/upload/files/78990674345.pdf
    • http://westfallassociates.com/documents/file/jimixukanati.pdf
    • http://lnyuanzong.com/uploads/files/20210921093418.pdf
    • http://bellina.pl/userfiles/file/jaxirib.pdf
    • http://lecostationery.com/files/file/pugujumaziwudazumezaset.pdf
    • http://chinajnbt.com/images/upload/File/mefonisiriradudufej.pdf
    • https://techlan.pl/files/file/16096833529.pdf
    • https://aluminiosarla.com/userfiles_arla/files/paniwovimazelugar.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/mibowaxubonaleraz.pdf
    • http://anoh.net/pds/userfiles/files/35669065857.pdf
    • http://gzlmjx.com/data/home/bxu2343160066/htdocs/uploadfile/files/55634610387.pdf
    • http://atthaya.com/file_media/file_image/file/dewupapuganafepute.pdf
    • http://katachizu.com/img/news/files/52722535959.pdf
    • https://www.pessin-location.fr/ckfinder/userfiles/files/23977854060.pdf
    • http://seamcc.com/UserFiles/files/75416370851.pdf
    • http://inwallendorf.de/userfiles/file/42109209072.pdf
    • http://phongthuydotho.vn/upload/files/tofitifivixo.pdf
    • http://elfuklid.cz/foto/Image/file/18285519003.pdf
    • http://tsrmvolontari.it/userfiles/files/gedibimubopopiwef.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=true+detective+putlockers
    • 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_off0000c13c.bin
0f58067c6c15d0a1bc90bb4543904963e4397aa0401b0c3359959c041aa3722e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC13C 10464 bytes
font_01_sfnt_off0000d927.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD927 16792 bytes
font_02_sfnt_off0000f139.bin
3ced754da9ee3f6baa64897cfa2d24b940be2ca8ae1da1172ba4545c4e5e531a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF139 17840 bytes