Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ab16e3acbd9e98…

MALICIOUS

PDF

85.8 KB Created: 2021-08-16 00:21:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1020f6359f439955dd868626dfee38bd SHA-1: 38aa52b6535bf761905b331fb19994a11c660e4e SHA-256: 72ab16e3acbd9e98639771a6544c3cd56833494edeecd696cedab015dc93b957
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and links pointing to potentially compromised CMS upload storage. The ML classifier and ClamAV also strongly indicated maliciousness. The embedded URLs suggest an attempt to redirect users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://rkdestate.com/userfiles/file/39608936746.pdf In PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16088e400d1977---vitizovemerodu.pdfIn PDF document text
    • https://edu-mate.kr/_UploadFile/Images/file/42219325115.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/60862b8efcb444bae8c87234c6f88b99/51643023309.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/62aa41523c9c4604638293ad0feaf6da/zituxenozexenifanuboxufe.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/burasilutirewudisazunegoj.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/46c8a1b3f6d0e2ad90be76c272d09227/kaxedijetirelopa.pdfIn PDF document text
    • http://laureysnv.be/uploads/files/bujaletazudogodi.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/a398eeecce06ec2915c3a2235ebbf29f/futowimi.pdfIn PDF document text
    • https://swiz.eu/files/editor/88225144536.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/28081306542.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/16082499d670da---86088279876.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/87350183580.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/073ti98rgdsbtve7ido823hpmc/xarupikumon.pdfIn PDF document text
    • http://jucal.es/images/file/fopimilazagugelezo.pdfIn PDF document text
    • http://theponghop.com/upload/files/zoberulubu.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/2tnqid0ia008snsmabscf4esh2/vizukap.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160995207665d1---wotajarupi.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/dbpaoqfudmanlc8slbeh0ks552/batawasefokaxakurejowet.pdfIn PDF document text
    • http://aa-nusd.jp/32660374229.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160842f4e17383---6960769509.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/a4e29c5a0df1ed5ff94d3e76f2cb5a6e/1851866670.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=coo+coo+clock+repair+manualPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10429 16924 bytes
SHA-256: f7b0ea5a2d06f528a9b275edae66478bf66240bc187cf2c77c9beb6f17dcd40c
font_02_sfnt_off00013088.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13088 10492 bytes
SHA-256: 13661549171a743004b9027311e38da88ffb5aacd0e087a684fa5e8f2a2ed4bb

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