Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a3822e11e148129…

MALICIOUS

PDF

82.3 KB Created: 2021-08-30 21:43:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9618dc8362c878911441823264037d03 SHA-1: a1642a8d96b1b88f612350d4470b99e91c5692aa SHA-256: 7a3822e11e1481290c9961d608b898c672eeefa66381a98bba230bf921956c32
156 Risk Score

Malware Insights

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

The PDF file contains a link farm pointing to multiple PDF files hosted on compromised websites, indicating a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary goal appearing to be redirecting users through a chain of links to a final malicious payload. The presence of multiple links on compromised CMS upload storage reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608263158cb10---91972077709.pdf In PDF document text
    • https://www.varishastalari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160734a11ce41d---josolepesimapamimav.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/8b2d97622deaeae285f190abfc4e52b2/7830521893.pdfIn PDF document text
    • https://curtain.jinware.com/upload/files/rotukixaloxalabowowuxigo.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acaf3da5fc4---batuxixokel.pdfIn PDF document text
    • http://novastal.pl/userfiles/file/71056985690.pdfIn PDF document text
    • http://www.dilipprabhavalkar.com/images/file/koduranidiviwikasoz.pdfIn PDF document text
    • https://astefin.ro/ckfinder/userfiles/files/zadaraw.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/779670c9882e53eb52c3e33a8f02054e/wufazisaderuwibup.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160768d2b802c0---mirufapifotew.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/a7a31e75d1c98cd637e95a4a739f68f0/gopuboke.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/ed67fa45d54aac01abc177e0b28a25b2/kipazapibetelibameba.pdfIn PDF document text
    • http://n2nlah.org/UserFiles/file/wujejumigizaxuximifizepo.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce246ccc2f---lafepupamobe.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/zedurugajonigejibiwi.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/83726146871.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c59a6eacf4---34113538337.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f81e76f557---marum.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/89b001a398d661df12cd4225d2535eb6/zawadidanaliwuranu.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/wavixefo.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c220966c83c---18901439092.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/50763246850.pdfIn PDF document text
    • https://maturana.cl/upload/file/jikoxobulonumimefuz.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/30337539645.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=i+have+recently+planted+a+hedge+ielts+reading+answersPDF 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_off0000dbaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C1 10888 bytes
SHA-256: d9c0b9340108aaf1a0233f58d5091cebfc2e2b259d619c85540fbeed1917b71e
font_02_sfnt_off00010cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CB5 17908 bytes
SHA-256: 0f656b7f639c0f4ad9be2345d1bc397f758135fd11c5c3a811b21b01318d99fe

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