Malicious PDF — malware analysis report

Static analysis result for SHA-256 aad38a35f09d75a0…

MALICIOUS

PDF

88.6 KB Created: 2021-09-06 23:16:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 48fa620cfc16c02689d94a9aa625a8db SHA-1: 3cd696acec1071229b9bb7851e36c0b528036b19 SHA-256: aad38a35f09d75a07f5db6e2d21fd5f1632b4e89b022e7ccda3ca8da22a2dc43
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and heuristic firings suggest it's designed to lure users to these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7033d64ef2504e41a3fc987b33a6816e/rowiwawuganarilukasumov.pdf
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/d548e0ab3f9a458cc19475cb2f5f18ce/73973290199.pdf
    • https://rachelrom.com/rescontent/file/71008168909.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160c911449f05a---mopobexemekoxonoxow.pdf
    • http://fvv-hohenfelde.de/sites/default/files/files/mubudorisoverexab.pdf
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/02c9040857e7b0b2a826606f8ac12167/tilikova.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e93c10d53---vavitetesojutimirogiwal.pdf
    • http://0930actress.com/files/files/94711857187.pdf
    • https://grandplaza.bg/uploads/assets/file/jinulesepar.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/77384d1dcdc7bc48a0702dce25bba712/gapidasopafubovidejaw.pdf
    • http://hookmyweddingup.net/clients/73542/File/65030904615.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba02310ae15---figelidazomolegoj.pdf
    • http://quaint-house.com/lazemumewuvagu.pdf
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd0c86850---vutaxolusajuzosamoj.pdf
    • https://foulardfotografando.it/file/56669563275.pdf
    • https://brickbodysupplements.com/newerac2c/userfiles/file/31405719035.pdf
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb2531fff---jevarikadafumelesowaf.pdf
    • http://elma-itc.ru/!upload/files/84391765750.pdf
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/1pvgl9v5fllu6icd2bnn9bgdd4/32152022939.pdf
    • http://bscartridge.com/pic/10287201900.pdf
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ed95ec1337---39810801398.pdf
    • http://narnivet.com/userfiles/files/vodozewobititatolekewep.pdf
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8439cc27bf---lutetasinexewe.pdf
    • http://syuncyoku.jp/upload/file/59461854685.pdf
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d094a47006e---toboxoxovokubojewofazor.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=parasound+p5+manual
    • 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_off0000f359.bin
702d2805136932e98befb9afbf2d94087da51adb6037afe2374b58f46d2ff88e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF359 18992 bytes
font_01_sfnt_off0001252d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1252D 16792 bytes
font_02_sfnt_off00013d44.bin
39d563f4562df26aa65099ed6673698dc07735c029bae5808c2c31d65c06fdaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x13D44 10468 bytes