Malicious PDF — malware analysis report

Static analysis result for SHA-256 b228690f9d65814a…

MALICIOUS

PDF

75.1 KB Created: 2021-10-07 21:37:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: d2494ccac344be0efe59741ea48d04a0 SHA-1: 37ded37756ce4c22e616b773b9ff76b823c4f6b5 SHA-256: b228690f9d65814a3363487f1155384b66cd846e17219d43ff6445b204c34983
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads or disposable hosting. The presence of multiple links to potentially malicious or untrusted sites suggests an attempt to lure users to phishing pages or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://linza-market.ru/upload/files/miwelekevabobolibuza.pdf In PDF document text
    • http://fasson.vip/images/editor/files/24792156265.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/96580797129.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615dfca5e46c2---11746624867.pdfIn PDF document text
    • http://uni-soar.com/userfiles/file/jobinozagoda.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16158bcb93c9ae---87946747745.pdfIn PDF document text
    • http://gabident.pl/local/userfiles/file/rupubum.pdfIn PDF document text
    • http://tilestone-pools.com/i/File/taravidomanid.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/mokoxipijigivizefewik.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1615ba6eb45626---48429829233.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/jokikarab.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615e868c0c784---46499299705.pdfIn PDF document text
    • http://thebodyclubonline.com/userfiles/file/memaborozidoti.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/3005429114.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/24795986639.pdfIn PDF document text
    • http://www.addvanceo.info/userfiles/files/getepifemofizumagu.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/berugipoliluxa.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/pilukejezojasixowuzulopoz.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/bikiresivawezirunoxi.pdfIn PDF document text
    • http://hyeminshop.com/DATA/files/79584516730.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/biledab.pdfIn PDF document text
    • https://siangyun.com/upfiles/editor/files/11847115667.pdfIn PDF document text
    • http://bandwidth.aryanpalace.com/userfiles/file/68941815359.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/ef77a98ec21846f90a2642800a2b2547/kisobajipowib.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/49247515950.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+do+the+standard+formPDF 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_off0000c454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC454 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC66 16552 bytes
SHA-256: 4dc51d1a4d8edadd5deb9510bfb38f33dd031b3af8dcd3d623f48ccb7531efba
font_02_sfnt_off000106de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DE 10556 bytes
SHA-256: 4231747ab26f054885ed7a2e52249c4ddb0ab5c80f8c5b2426e5726451fda238