Malicious PDF — malware analysis report

Static analysis result for SHA-256 841a75dab9dddfc3…

MALICIOUS

PDF

90.7 KB Created: 2021-06-27 02:06:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 65fdb033c02c56f42d8ecba0ae93f3f7 SHA-1: 89a9a30eed6a68c7c2bbaeaf6dfbc86e6ca2f00d SHA-256: 841a75dab9dddfc31f05373f889326a544f8676ff0e3755a194f493d0741a83a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious. Heuristics indicate it functions as a link farm, directing users to multiple external domains, some of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to drive traffic to potentially malicious or phishing content.

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://shopinhome.com/ci/userfiles/files/rugebefazivofut.pdf In PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/9kujqeklkll3faud4tk0j0ugp2/18971040717.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a864255fc63---topafug.pdfIn PDF document text
    • http://studiosimonepantaleo.it/userfiles/files/manofuxupaxiwatebiwo.pdfIn PDF document text
    • https://thaihoanghung.com/upload/files/86138707515.pdfIn PDF document text
    • http://laweasy.kr/userfiles/file/mitadigitizevuxoliwemujag.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16095d1c68d534---bupur.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0e0c607fe8---57720412767.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d6b0cac0d---tusireluwat.pdfIn PDF document text
    • http://cuacongtrinh.vn/upload/files/25978412046.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/653dfc27641f54746757f54fb974166b/kovesunan.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/75mkr3046qee0cfhdmqe01slmb/xijumedikililaxofi.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/kadaxolutejetodaxen.pdfIn PDF document text
    • http://autosklo.sk/pictures/file/30502621564.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608742d489392---9336797344.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160873029db31d---98929040542.pdfIn PDF document text
    • http://dxczx.com/ckfinder/userfiles/files/20210603_164410.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609427649c51b---34494067297.pdfIn PDF document text
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rebixiwibobifalizokema.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/48764153407.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160755e0c0a80a---51261754865.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/85601552474.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc91a029c1---fugazojesifukojup.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/pelewuluvipapi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=ultimate+spider+man+game+pc+free+downloadPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF52 11056 bytes
SHA-256: 43e7166624d290d03de778c1d550b304de6ec8ddabb9e82b3282d0744e4a610c
font_01_sfnt_off000118e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E0 17040 bytes
SHA-256: a782f418d884943ef1d034823df1f0525b705911dae3b5d5a953256ed6ac0fc4
font_02_sfnt_off00014560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14560 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1