Malicious PDF — malware analysis report

Static analysis result for SHA-256 eec5756145b9dfb1…

MALICIOUS

PDF

90.3 KB Created: 2021-09-07 23:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ad48835f5b0de0122474bc1f039f53ff SHA-1: 3e9fae3ae9a25920f168703684cbca26f819028e SHA-256: eec5756145b9dfb1c23c587cfae38d342f143c15d49faf1068f9601a59d727d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs pointing to various domains, many of which appear to be compromised WordPress sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting an attempt to manipulate search engine rankings or redirect users to malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://garglob.ru/uplcv?utm_term=electrical+measurement+and+transducers+and+industrial+instrumentation+pdf PDF link annotation
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/846113c1353dbd601a1d22731201f39a/fikoxepikaliforoxitomiz.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098b8766ec7b---ralogixudav.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/68a704c7a0064f956ffd0cd4fb7e1ded/tulusated.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/girapavotiroxesokibugo.pdfIn PDF document text
    • http://spalovnachemolak.sk/userfiles/file/19876350041.pdfIn PDF document text
    • http://kajsanordstrom.com/userfiles/files/44670986333.pdfIn PDF document text
    • https://shopabrang.com/images/files/59442035406.pdfIn PDF document text
    • http://freeski.hu/freeski/file/sepuzalojelu.pdfIn PDF document text
    • https://vydavatelstvoklett.sk/userfiles/file/22912170279.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160be48c17fbc8---35602412197.pdfIn PDF document text
    • https://jagamimpi.net/contents//files/78576987231.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/60444742011.pdfIn PDF document text
    • http://www.stadion-zarya.ru/ckfinder/userfiles/files/15008664066.pdfIn PDF document text
    • https://estoniapools.com/contents/files/rexisubipufem.pdfIn PDF document text
    • https://hpsoft.shop/upload/files/juwepubukunezumefomo.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db66e6b32fa---42278130353.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/kakasizanetigude.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/fitowekamukepusimumuv.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9b22227fa---75068603256.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/13a4432d67e5828b86caf8c313189377/sinobinukafuba.pdfIn PDF document text
    • http://bhs1966maui.com/clients/64750/File/47215251172.pdfIn PDF document text
    • https://jpjplumbingandheating.com/FCKeditor/file/wafefoxesi.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_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 10864 bytes
SHA-256: 6d916ec8d019fd67d7ef9d4366ba8ab88620b5bd7d2ea57c30bb8aecd7be20d1
font_01_sfnt_off0001153c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1153C 17532 bytes
SHA-256: 60ac2c87da2bd91d21075072d8324b6b563f1b8ecb4c288c55da3f28135c2e35
font_02_sfnt_off000142a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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