Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b3a54b9bda0975…

MALICIOUS

PDF

87.8 KB Created: 2021-07-31 02:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d328b585288373b49294f865f093b464 SHA-1: 5c4842f9f05f21ec2820f0184a724dbbb3587da3 SHA-256: 33b3a54b9bda097557e829c350b260b04296106816292a0a5d2b34cb8c70555d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on compromised or disposable domains. These URLs likely serve as landing pages for phishing attempts or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://ketchas.ru/uplcv?utm_term=profit+margin+ratio+formula+excel PDF link annotation
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160990a0e1d6e4---80330771191.pdfIn PDF document text
    • http://buddhavehicle.com/userfiles/file/21084722112.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/lr52umjr595h34v3o2n820qf1r/84133969035.pdfIn PDF document text
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/tuxazezerapowuvekuben.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/ximixekisurulaluv.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/52166691580.pdfIn PDF document text
    • https://fivetc.net/uploads/files/21131940609.pdfIn PDF document text
    • https://schreinerheusi.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e19024ead2---kezenagufidakujibaf.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/47529033219.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/1608c11bd9cc7e---65672927549.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/07/10/file/20210710_141939_161.pdfIn PDF document text
    • http://hykylalumni.org/userfiles/90007174759.pdfIn PDF document text
    • http://jrmhandling.nl/upload/file/veluwi.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1607b41f80e40f---80365112506.pdfIn PDF document text
    • http://accronline.com/userfiles/file/vofujerosomobebone.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16102e9774b953---23657271810.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/wateletosu.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/depejonegop.pdfIn PDF document text
    • http://inistor.com/ufiles/files/lefigolatowabofusexokiza.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e03fd8c6cb69a0b0e9f8b4b71038adf3/xoluvazowevoxavofenatok.pdfIn PDF document text
    • http://piemonteforyou.it/userfiles/file/xikebomajoduxemanexixaw.pdfIn PDF document text
    • http://www.dj-csnl.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096af6b23d81---69942273595.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/a52c75d6d3aac187b588e95ae465d661/73554553795.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/fj8967ikm00u0tgn816voiplk1/27900055471.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a5388e84a96---sixemori.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/juwagipi.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_off0000eead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAD 10712 bytes
SHA-256: 9cfcc7e4c875b3911e7c1fe0fa9e0e2b57f432948b9caefa71ae2f3755c4b4b3
font_01_sfnt_off00010748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10748 17888 bytes
SHA-256: c3e0d4345d9eaea05b9f2ef66ecc295a6d621d0d709554744abaf36936237552
font_02_sfnt_off000136ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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