Malicious PDF — malware analysis report

Static analysis result for SHA-256 091c7f41f5815432…

MALICIOUS

PDF

82.5 KB Created: 2021-07-01 10:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6d166dd6a8d007d893ad6698abebed5 SHA-1: c9e3d01cf19d15f6fe6d231170f9792e95688ca5 SHA-256: 091c7f41f58154329b5185a30eec9bb5977d810c9195533788a55403d3b200cb
164 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, suggesting a link farm designed to host malicious files. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://www.autodepotperformancegroup.ca/wp-content/plugins/super-forms/uploads/php/files/pfnb5rad8evinnpij3cs54b3sj/80791038631.pdf
    • http://bayanairag.com/uploads/userfiles/files/9869633958.pdf
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/cf47f11d9129d2d38edfcbff14c5b92f/47990806338.pdf
    • https://aneri12.eu/res/file/zolotawozozi.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607ae76426770---55007412531.pdf
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/29f2861811a31d08221bf5d6a609e41c/paxezasiz.pdf
    • https://vansuloi.com/uploads/userfiles/file/muralidijajivodumolo.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a384d192955---391838186.pdf
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16091f66dc3dd2---11223913236.pdf
    • http://abacusnancy.com/userfiles/file/rudusagelul.pdf
    • http://ckpak.com/fckeditor/userfiles/file/77264136189.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098fd7fdaaef---90243057275.pdf
    • http://nprofit.hk/userfiles/38646513557.pdf
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/236165c20ce533ed682beff3de7ca14c/momigenolezedoduf.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/19588a786f6753fdf664fbdc824e3205/vifodoboluwozujoxog.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b211a3613c3---bozobudexufosibotopuxarik.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609929568936c---pobabebezokatodekaso.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160dcdd5d06f40---xofuxedijabij.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/fadozatezosazowesudaxibap.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/465f34647104d0be5d2c9ce319c42324/bemalawekixapedibasib.pdf
    • http://elsekmont.eu/userfiles/file/61609011669.pdf
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/f7l6dsmkski9ciuumj6bbh90r4/76944843225.pdf
    • http://cherryontop.pl/upload/fotki/file/67585530860.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608563dd8c01c---negobowaxo.pdf
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/1f76795d75878ae0399fbccfb3ad54cf/sixatitemetilokomagum.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=whack+the+serial+killer+download
    • 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_off0000dc40.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC40 16792 bytes
font_01_sfnt_off0000f452.bin
41e2fc751e0ed22a6b23e74796a2382f990f5aba88cb903d6d2dcf999fc5c7f1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF452 18372 bytes
font_02_sfnt_off0001244d.bin
61e83dea1a534c9ddffd4ba10236c7857fe4af0bcb17e778a0bb2a1a274c9b51
pdf-font-stream PDF embedded font (sfnt) at offset 0x1244D 10636 bytes