Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcc9443d6c478a8…

MALICIOUS

PDF

87.3 KB Created: 2021-09-01 10:22:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 71b9ea2f3ebf6708ba357bd3eaa89d4a SHA-1: fef6ee5c0bdd56321e0737ae4f95038034f49b49 SHA-256: 5bcc9443d6c478a8026d3643d2e0e29fb095e09b46422764629a641f22f1991a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://inwebjor.ru/uplcv?utm_term=photopolymerization+3d+printing PDF link annotation
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/3299b9a877ee3b95b8f055d28181ce33/28467622117.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/34675973334.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/63637484053.pdfIn PDF document text
    • http://unsersohn.ch/images/file/furuxuvuxideranetosiwo.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/zabepoxajikexo.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/5222ac5ee82050cde99b9c81b5758729/nukuxujilalewiwagafopobu.pdfIn PDF document text
    • http://sebatmakina.com/files/zawabumopovaropedorug.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22e4c438dc---lomaluz.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ed6a66ce16---kedibejukavufugemawu.pdfIn PDF document text
    • http://gingerbreadvillage.org/clients/e/e3/e396b250b60561adcb946853f9f62e29/File/87066156401.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/c5ab314f917eacb3a93de56d1a37943e/43064621849.pdfIn PDF document text
    • http://assessmentinsight.com/ckfinder/userfiles/files/12914425966.pdfIn PDF document text
    • https://ktmcollege.org/public_html/userfiles/file/gejomanijuzugur.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/11150000177.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3c0f14ccd---rajobamunedazexiju.pdfPDF link annotation
    • https://caffedisanto.it/file/zidogapumewobex.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/lopujajilarasijobejuvoj.pdfIn PDF document text
    • http://hongpakthai.com/ckfinder/userfiles/files/74127785182.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087850d8cda1---filulilis.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160a3bdaf74ebd---figemawajivolixegegeje.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a86e423c47f---jijifujixovep.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/17040472723.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160949cf77588c---jegelefegapaxuwi.pdfIn PDF document text
    • http://ctkupavna.ru/upload/file/59466363604.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160808ba1cabb3---96670246262.pdfIn PDF document text
    • 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_off0000edaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDAF 17964 bytes
SHA-256: 489818de256d184b78a60220ae0a4ea13775fef2e4fc45c1463bee00a7ffc102
font_01_sfnt_off00011be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE3 11016 bytes
SHA-256: dfb50a4f61e7b1856cdd144d6c30a0c02a33cb8551599054db23282b04ea912c
font_02_sfnt_off00013528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13528 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1