Malicious PDF — malware analysis report

Static analysis result for SHA-256 b847d22615cf3941…

MALICIOUS

PDF

97.9 KB Created: 2021-07-13 23:19:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db829cb2088483ded564df70f5bd0188 SHA-1: 451953879a19682d335de03eb5be29c5f5697515 SHA-256: b847d22615cf3941786a9b45646d1cd456d3d24cb003f5f8eb114ed51c041d0c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. Multiple heuristics indicate the PDF contains a large number of links, many hosted on disposable domains or compromised CMS upload directories. The primary IOC is the URL pointing to a PDF file hosted on a compromised WordPress site, likely serving as a redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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 http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607593164ddb9---fepiva.pdf In PDF document text
    • http://dejede.com/userfiles/file/kedit.pdfIn PDF document text
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/90555655786.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e42061b10---53800414245.pdfIn PDF document text
    • https://www.nrlandscapes.co.uk/wp-content/plugins/super-forms/uploads/php/files/3d3762802b2595ddbedc50da4c02c285/38042684603.pdfIn PDF document text
    • http://gospelinamerica.com/clients/874377/File/modenisunotutogowotavef.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/38ac9a5913e3231f71ca7f1a06c406df/57318759027.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e5491d74ba174bbb1e670404998b57b9/jazoriwubekuf.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/26636182610.pdfIn PDF document text
    • http://bluekeydigital.com/images/pic/file/5764552602.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c204209e0---dubiv.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/8067e721531d59d8910378320117f866/78759287403.pdfIn PDF document text
    • http://sgpeo.pl/users//file/58928130505.pdfIn PDF document text
    • http://kwik-it.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9454cc590---24982613055.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd1eb0d9344---dunevif.pdfIn PDF document text
    • http://local-minicab.com/survey/userfiles/files/23355100446.pdfIn PDF document text
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b748b45c1c3---mawovivuwigumajavewufed.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/80t88qn2mmi6loc6bc79oji8cb/10968708059.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609464bcecbb3---10540807898.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a13113cf9eb---tebete.pdfIn PDF document text
    • https://immobiliaresancarlotrieste.it/file/sixikupozumutovuvaso.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/mexomukobejoxomava.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081429e6f215---88508766517.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/16083595dbcf32---56166179508.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=mmi+meaning+medicalPDF 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_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 17416 bytes
SHA-256: b54b3c0a760d219a8683bd084cbac33afbf4c57eeac7142b02070c35d193a5c3
font_01_sfnt_off00014bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BF3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001640a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1640A 10220 bytes
SHA-256: e1ce80f22efea4aab7082dc4b51da9e83351b4c9fadaa230858ebdc273afebea

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