Malicious PDF — malware analysis report

Static analysis result for SHA-256 36501384d6d63471…

MALICIOUS

PDF

96.3 KB Created: 2021-06-28 02:31:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0e86e5737f87673e5b42c2687b406eef SHA-1: a3acdbfea49e90a6490a9227aa8a9c8a881379e0 SHA-256: 36501384d6d63471d56846b63ffdaefd8e6240869a4d9f4859a1ab86317c3d96
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple URLs hosted on compromised CMS upload directories, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous links on potentially compromised sites reinforces the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bc704f726---86120824920.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a985e51d---ronafonog.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc50880a539---fekananokonawototokegowi.pdf
    • http://bjsprt.com/uploadfile/file///2021052917560093.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210605041812.pdf
    • http://filtrydokoparek.pl/img/all/1509420015.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/6756159e6f5a82d0ca7f0f222b971513/lozomimabu.pdf
    • https://arvikabc.com/images/uploadedimages/file/wojufaxoleworitiw.pdf
    • http://fine-cottage.ru/userfiles/files/24817697131.pdf
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607ef66d2d37f---88562157005.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8bebd1f267---66014028391.pdf
    • https://styliststudios.com/imagesTE/file/20226816271.pdf
    • http://moyamoya.center/images/hand_uploaded/files/kisibe.pdf
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/2bbd59232a76d09cff499b242592478d/didaximamesevelibo.pdf
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3a4782c23b32c36b37641439678b079f/89804149693.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e1b550be6---tatevigurab.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a685980a334---67044711219.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/1taettsoo66mfpf98no7a193e6/28745690824.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7a45cc0f6---xetuwen.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f066bdf457---nilodivaxixarusutafemov.pdf
    • https://nilsagame.com/calisma2/files/uploads/peziwuxi.pdf
    • http://allprintusa.com/admin/images/file/zowinoririturej.pdf
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/fmeuk7v3d12nnbi8agrh8l3jlo/3430919453.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e414e5a17864d4bfc6f66952b68262e0/63444967139.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fff8a74d2---pobudagidikusaj.pdf
    • https://eviinstall.com/userfiles/files/70532763089.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=engineering+an+empire+worksheet+answers
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000111f0.bin
5e513a451ceb1d6680269be58cd85a5c7523d03a4bce1ebc142783c1ceee9ad4
pdf-font-stream PDF embedded font (sfnt) at offset 0x111F0 18580 bytes
font_01_sfnt_off000142aa.bin
9f81ad14916d8a18c5e1bcb76d361e5b4c797c75000a187801ff455e17f9a4d5
pdf-font-stream PDF embedded font (sfnt) at offset 0x142AA 10812 bytes
font_02_sfnt_off00015b7d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x15B7D 16792 bytes