Malicious PDF — malware analysis report

Static analysis result for SHA-256 df5098171e529255…

MALICIOUS

PDF

88.3 KB Created: 2021-09-07 02:32:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: fe51519e99061908f4719707437799e0 SHA-1: 95c1acb2f5a7a3fd70562e880a204bd78727564e SHA-256: df5098171e52925551a723e2b3c87f8460dbcc466109e473d82e95ef56578301
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a tactic to distribute malicious content or phish users. The PDF structure and embedded links indicate an attempt to exploit vulnerabilities or trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://synerhu.ru/uplcv?utm_term=tratamiento+para+hemorroides+externas+pdf PDF link annotation
    • http://aj-logistics.com/stock/userfiles/file/kisulesorevigixaz.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/76ec90da7c9ef132a30bac2c80016e8c/mazegabotefavuvarapazi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/getubumepiniburunil.pdfIn PDF document text
    • https://ekinyalitim.com/depo/sayfaresim/file/subaru.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/33840233619.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/jasoj.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607903b1d8f87---89762466882.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/benibejitoj.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/d3799be27a49bb54351f6aafe3841b54/22075232955.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/184457943981a92df0173aa4de3ed39e/patujudifura.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/66714842747.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/08708ca3673c979d0f9e91acdc276817/60570199513.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210501202159842226822.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/1722512174.pdfIn PDF document text
    • https://maintogelonline.info/contents/files/lotuvusoninuzudifakazi.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd601e5747---2112448175.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e93fe961c---65574975234.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/39837976992.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/71067820155.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/87796153989.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/kexubixasolipelada.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16097f7506c260---23533629429.pdfIn PDF document text
    • https://investainternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4d614592f---54987569356.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/17226587585.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//judomulizunike.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_off0000f171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF171 10780 bytes
SHA-256: c35b43ce9cbb576e99a70719ce5285f47b30efd6e53b9d9a7b6721542311bd49
font_01_sfnt_off00010a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12227 19300 bytes
SHA-256: aed960de09da91595275ed74a61190454de48f7bbac1b91885a9c224d3c561eb

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