Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1e6984bef22f50…

MALICIOUS

PDF

118.8 KB Created: 2021-07-21 15:35:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 752c3d0e2c476fd21e30c692a7b193b9 SHA-1: 89261c11b7d492c079818d6298687d09beb7c7eb SHA-256: fd1e6984bef22f508036a47a7c4548710bad96b859d23547793ad27687aa9345
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised CMS upload directories and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9506

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://assignmentmart.com/ckfinder/userfiles/files/lazofiv.pdf In PDF document text
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/6bf38a30a99df2e82bfd8db5ee8a6159/74566131797.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/82268185469.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/lofezise.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e595d6adba---96090942527.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/semeze.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/rlaaiktgv4bts79o3lmk0f8idi/52094997156.pdfIn PDF document text
    • https://yuss.it/file/vuzekanoramajajapexututa.pdfIn PDF document text
    • http://xtra360.net/campannas/file/37517819188.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c918329e44d---dejiridatizaxe.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/38d8663ea7dc49e309240ea584e90cdf/81293266013.pdfIn PDF document text
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969cd213f4f---xakojesajozuxafefopu.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/ramemibigawuve.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/29675266632.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/sulodajowilibani.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/pifitedi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8c0b31cb7---99526586394.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098a9e6d2da2---82318499277.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/70375466469.pdfIn PDF document text
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/kaxapazuwenugezopi.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/8a67847b241c0c346d88160ac47a8fad/mekufejevodegokexigu.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/ef4adc1f0a30e1320062eff4e46153f3/73730354979.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/2vmtphatj9jhej481j7teav6b6/1806341368.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/d23b1fcd312fcc21ab38d0b58768507f/17258151079.pdfIn PDF document text
    • http://jyjwqj.com/uploadfile/file///2021070209104187.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/64488961550.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/bb483150793eeb1e428cb92d3fb83bef/lesafufamilubatofoxuve.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c4a92fc9e---38502096342.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=definition+for+assiduousPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012505.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12505 10404 bytes
SHA-256: 0bcd6ee146fd2c025f090c8ef7fc6bc26f5f5c6611b07f40941054dcd27be6a7
font_01_sfnt_off00013cad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CAD 3344 bytes
SHA-256: d4851d3a39b22926cd6d22f12d583700cd02cfeec498c9fe76dda6786e45ca03
font_02_sfnt_off000149e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000161f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F9 22240 bytes
SHA-256: 500f6e0a1d1ef9c52b22fd936868a22f8eec99f811b6bbca1ed726463d9d702e
font_04_sfnt_off00018805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18805 28732 bytes
SHA-256: 7313009b1b0e1646d39ac2a991f24a76aa08431b63834bf2d64f7e0376f3ebe1