Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d3248132950cf0…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 06:54:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1185b6052f839512bbaba033ca75c65d SHA-1: b9768005c58d023dd88a6ab273d7cff038b90893 SHA-256: 81d3248132950cf0063c6ab9c4ebe2981789b247bb0f38037eb1aeb862705514
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, which is a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination or distribute payloads from various sources. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://talleresjpg.es/img/file/95441630471.pdf In PDF document text
    • http://revize-elektro.info/UserFiles/File/14440762042.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/85664664616.pdfIn PDF document text
    • http://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ecda539483b---55493119708.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/tusekovat.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/kibakafogopogotagoxi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2c65d60404---99033961816.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078aab1307fb---87904140638.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/58811254073.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/wasituwotavuvuzo.pdfIn PDF document text
    • https://austarpharma.com/upload/files/zogunedaferep.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/53582754708.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/44958270550.pdfIn PDF document text
    • http://consorzio-csa.it/userfiles/files/15437982286.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/cf041479eb42ba1ae2510823a14bf2bb/95191562258.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/21345d7452f8d74b08eb8f945687b698/merexajemazimugi.pdfIn PDF document text
    • http://puntolinea.org/userfiles/files/89048647159.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/011846bd9d4fc1edf9dbb971e82ca210/lojativewudalozid.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa8b701ee6---mekulibojipezumid.pdfIn PDF document text
    • http://sun-green.de/ckfinder/userfiles/files/95701097278.pdfIn PDF document text
    • https://silatur.com/js/ckfinder/userfiles/files/83300222303.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e2a79baef---foxadevidix.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/duohh6n9um9ffjom119b14jih6/73507885799.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/dakugaxeremiritefafugepuk.pdfIn PDF document text
    • https://mercerapparelss.com/userfiles/files/zirowuzotapo.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/kokomazowusonobivekuba.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=comment+grouper+des+pages+pdfPDF 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_off0000d831.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD831 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f048.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF048 10836 bytes
SHA-256: f8ef749346932bffe8906f86b856ca82f080e953a98342bdb557c6a4f1da9139
font_02_sfnt_off00010917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10917 17748 bytes
SHA-256: 1f0b734ef93c147957d1b31c3610537715851a2932a5781ce681ca338f825895

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