Malicious PDF — malware analysis report

Static analysis result for SHA-256 28b8208a8ceaacfe…

MALICIOUS

PDF

90.6 KB Created: 2021-07-03 01:12:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1385ceca313ff41efd14696ae0aa16a8 SHA-1: a51069d2a8df60b108d8034ede9d3a352f57a6c2 SHA-256: 28b8208a8ceaacfe893a17bb6fed0308f2c2d6b1d4e44960d61e506fe9585ded
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan-like behavior. It functions as a link farm, with numerous URLs pointing to various websites, including those hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nadamasristorante.it/file/xininitinidegi.pdf
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/mjb4djb7h4nlbtkbhmfu43obkv/finoxazu.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ea7f97cda---45947840588.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/db6af17364a21fb1504189e2b386301a/batisevugejasapixuxeje.pdf
    • https://przyklejki.pl/userfiles/52307070262.pdf
    • http://boathousebrokerage.com/userfiles/file/kawabupewuj.pdf
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbdb63ea8e5---pofulagajasigu.pdf
    • https://bishopsalamatkhokhar.org/userfiles/file/87493633609.pdf
    • http://ikkosushi.com/uploads/files/dujifobejebalizi.pdf
    • https://demircanticaret.com/userfiles/file/delago.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-7/20210507012621868575.pdf
    • https://aartipalette.com/userfiles/file/67683515199.pdf
    • http://www.tomasjelinek.com/img/pub/file/77790782653.pdf
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c21e9370e42---rokewafate.pdf
    • http://candemdientu.com/Images_upload/files/muvovaxodisazenotag.pdf
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607635a872dea---57723626310.pdf
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081277142da5---duzadaj.pdf
    • http://bakoca.hu/files/file/79550381232.pdf
    • http://dhsclassof70.com/clients/d/d1/d13f49183e6b2ef720c1f353b43de0f2/File/99906097428.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/xadikudasirikirerur.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/a30ed8ed8c9d3cc2e956808a5b390233/tijatakibepasomipodur.pdf
    • https://www.myosiaffiliate.com/199trust/img/file/zogunebikisilaxunog.pdf
    • http://davisfolk.net/clients/1/1f/1f1070e31f35868a9a13f38ee7dc887f/File/bokakezotonutuvotifodefin.pdf
    • http://sistersaviopublicschool.com/userfiles/file/nizokewizamowenebure.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=prince+of+wands+thoth
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e80b.bin
d87d0bea71570cefbde94add925b9866672e4a90f36fdd6262c96ab9572849ec
pdf-font-stream PDF embedded font (sfnt) at offset 0xE80B 17448 bytes
font_01_sfnt_off000115cb.bin
4f3dc242f84557e334c29ef27f4fa46d8b4b9b347da8adfc72da7072be8f0387
pdf-font-stream PDF embedded font (sfnt) at offset 0x115CB 16444 bytes
font_02_sfnt_off00012c6b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C6B 16792 bytes
font_03_sfnt_off00014482.bin
c418761942451dc5f4914d60a2fe6e4c32c5eaa49df00f7f6e3918da5367bf9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x14482 10616 bytes