Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7debe27273d0b1…

MALICIOUS

PDF

87.9 KB Created: 2021-06-28 20:21:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 15bab8e9870f8740fb072ec3d4c41f55 SHA-1: 7428dfec9ec408fa489e42fb3c96f90e1b1ca105 SHA-256: dc7debe27273d0b16ebb5d0e7d7033ee58bd4647d9dcdad2f15db3f7e576bf57
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://creteservices.com/FCKeditor/userimages/file/fomebevibepe.pdf In PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/43545880bcc030c92917ac92a483b3eb/39770391713.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/3a87c0232275a51efd0dcda5d6f06cf9/xaxewetufine.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/37219001228.pdfIn PDF document text
    • http://prestopc.it/upload/file/34632520232.pdfIn PDF document text
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfc3ae0e03---komifanovax.pdfIn PDF document text
    • https://aspirans.com/files/file/71962291874.pdfIn PDF document text
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/sbmpuvfr805rdvlur11lnkr75c/wilisoxawefowizejub.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/160721aa370cd3---kizulokekobivo.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/19061308906.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/d72q7ivd3m74vktvfho62qh72t/95205800167.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cdcc5c873d---muron.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/gepifarakudodi.pdfIn PDF document text
    • https://thesaddlebank.com/wp-content/plugins/super-forms/uploads/php/files/4fq6sron7ihcufs5rbag22qb6i/wokosegulenogab.pdfIn PDF document text
    • https://yidinfo.net/wp-content/plugins/super-forms/uploads/php/files/39vlaqfs7j374452dh79um2fmv/97887156487.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/8495b82f94075c9c53c14ee1747cc69d/37535056279.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094681e4bf21---23906207791.pdfIn PDF document text
    • https://loyallcanada.ca/editor_files/file/90485909375.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/h7ulkhvk5grs0dg64ksa6rtht3/44278366262.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16099166f1e032---47318679951.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160829dae1894d---vajixokejizuxoxumolelorij.pdfIn PDF document text
    • http://archinfo.ru/uploads/file/32679366694.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/44269305449.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/cga4scgji5sdomc5g84kfagmhr/gumiwaxipeja.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=install+unknown+apps+android+10PDF 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_off0000f3d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D5 17508 bytes
SHA-256: 3a0d4216defc03232dd7a1ade4afb538e0c7ada49c26f724ac72cc8a0944aaba
font_01_sfnt_off00012184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12184 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001399b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1399B 10656 bytes
SHA-256: 28d6be0f072c1b4ec5dc2ce9a049bf5dbf959f5b97ccbdd4d4858b7df25cbb47

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