Malicious PDF — malware analysis report

Static analysis result for SHA-256 d85348bb513713f1…

MALICIOUS

PDF

96.7 KB Created: 2021-06-29 11:26:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 41bb588875554e79cf6f2adb8352a5ad SHA-1: 013ed86fd80b3427558a5a39099ea1ef41baa86f SHA-256: d85348bb513713f1c74f20c06ee523d1db9424741d7a4a0d61bbea4df507a468
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, suggesting an attempt to distribute further malicious content or phish users. The presence of embedded URLs and the nature of the heuristics strongly suggest this file is part of a phishing campaign, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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 http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee21761165---56596818648.pdf In PDF document text
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/9dh61ic68qhjc6ufpl2ong20vm/61335173274.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/iq3uv6023dm18qdqourph7tn50/35994452153.pdfIn PDF document text
    • https://dineflon.com//files/88627529146.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfe9349502---44106962655.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f8b91646b---95370629316.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/lufafoxerewudegatanizuru.pdfIn PDF document text
    • http://aps-mes.com/files/file/55661877185.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/fikimevedurelojavutosuvob.pdfIn PDF document text
    • https://topclassgreenery.nl/images/file/88531969839.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/bu1kibrseh71q4ktgj16g8jc6d/wawapatowuna.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/zimugakowo.pdfIn PDF document text
    • https://maximatrimony.com/ckfinder/userfiles/files/texodokipek.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d8c8f13394---tivolipewozexotijulu.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/74029999212.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/30dc15a79a089192545fa79dc02ae015/79662102254.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/9cab23262476670b9ce17506fa8e9cc5/30916227346.pdfIn PDF document text
    • https://www.picmephotoboothhire.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b46835a6---gofufovumomi.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/b1749e4dd1a9ae93ea651afa1e507d3c/fugogixa.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/40141400730.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/9u5qq52f8nohs3fgak20ahnom3/39041198703.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/dea964d090a5adb7329f18dc2a7d1c98/pipozefozodedadadewo.pdfIn PDF document text
    • http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a58648af48c---99986090325.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/khe5usei59pqrrmqjdr8gsc3n5/niposisipowog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=today+night+lottery+resultPDF 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_off0001161f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1161F 10704 bytes
SHA-256: 1c210cc1bb96bc1dee85af8abecf8890151bbe179ab820e91f37116fd045d1c7
font_01_sfnt_off00012e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E71 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014683.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14683 17364 bytes
SHA-256: d1eaeb9fe051c7076969779acc090085f2c86762c973fa25e2da044ab6361be5