Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf84b85fef3f991a…

MALICIOUS

PDF

84.7 KB Created: 2021-09-19 00:09:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 61d0de1d4067c72c0dd921b8aa533477 SHA-1: 38a83c97032e8e6fcc8afe196b415377bcdc259e SHA-256: cf84b85fef3f991aa480436d116c57cfb12a8d4e92cc3db269e1a648a3a0f571
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • 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://jss-moms.si/upload/File/14343205167.pdf In PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161360a65af394---18120154823.pdfIn PDF document text
    • http://oa30us.com/userfiles/file/wolulejuxupuf.pdfIn PDF document text
    • http://211.129.1.225/system/ckfinder/userfiles/files/62986481327.pdfPDF link annotation
    • http://shqinze.net/admin/upimg/file///pezugelu.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/tomamezepoxod.pdfIn PDF document text
    • http://ofitecnic.es/files.ofitecnic/fck_up/file/fumonezojeg.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141564d2c65f---peguvibi.pdfIn PDF document text
    • http://storemisr.com/uploads/files/faxodovuki.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/78263997096.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/55847862505.pdfIn PDF document text
    • https://myvideoclasses.com/ci/userfiles/files/70827052370.pdfIn PDF document text
    • http://educaholistica.com/resources/img/imagesck/files/pasusujed.pdfIn PDF document text
    • https://beautydent.hu/editor_up/magixobudukawebavaloj.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/29654550542.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/93166117192.pdfIn PDF document text
    • https://funke.be/data/file/29234536770.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/161425140f3ee4---49253483709.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/bedaravexomoxujejap.pdfIn PDF document text
    • https://maxlinder.com/admin/assets/ckfinder/userfiles/files/72263460683.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/2021982214104046.pdfIn PDF document text
    • https://akonis.ch/userfiles/files/16268762276.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/raxoxoxeberavejeme.pdfIn PDF document text
    • http://dietmoiquangle.com/webroot/img/files/xogilima.pdfIn PDF document text
    • http://sushimura1.com/uploads/files/bibujozalezedago.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=internal+audit+third+line+of+defensePDF 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_off0000e55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55B 10504 bytes
SHA-256: e580a4ff85e54fe1a8c9a1f1aeb6e07b8ff74edb19b1480c18c671431fe6a97d
font_01_sfnt_off0000fd1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD1F 18208 bytes
SHA-256: 898b3e21300f8f2f33dd2f3a4d455ce5f217443cc1f7208261c0b81d7b78245a
font_02_sfnt_off00012cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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