Malicious PDF — malware analysis report

Static analysis result for SHA-256 abc86bb050be9949…

MALICIOUS

PDF

83.1 KB Created: 2021-07-04 22:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: fe776943292141700169add4c4f6a7be SHA-1: 578f3b05279fbd9fc4d03209e747823575fa5d6b SHA-256: abc86bb050be99494930dee5b14795b726358cb368d7b00108a3e05a874fe9ef
176 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various compromised CMS upload locations and disposable hosting sites. The embedded URLs, such as 'https://drafthe.ru/uplcv?utm_term=addition+story+sums' and 'http://157.230.241.115/image/upload/File/37577293861.pdf', are likely used to distribute further malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://drafthe.ru/uplcv?utm_term=addition+story+sums PDF link annotation
    • http://piau-po21inn.com/CKEdit/upload/files/xapuzizazimexokasabunita.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b03a8aa5a9c---xodenapuketufe.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/a8ad8648b84871a96567deafe3b59ac3/juwowove.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/49082213282.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/vs2n9j4ns57ts108rlsgl03775/79113864619.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/2647249677.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/7469773942.pdfIn PDF document text
    • http://fulepmark.hu/nyebu/fulepmark/userfiles/file/83625008072.pdfIn PDF document text
    • http://firegallery.ru/img/upload/19737962054.pdfIn PDF document text
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/744bc968e280b5a01aa6388ab6fab661/91346917280.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b9512b8db---37973310740.pdfIn PDF document text
    • http://arslanemlak.come/file/66573303499.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a10c23e1796---24514127852.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/c97aabb397aada7330e2cdb46c282f65/25645883811.pdfIn PDF document text
    • http://157.230.241.115/image/upload/File/37577293861.pdfPDF link annotation
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160a8887b5efe6---19222946807.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7d1031248---zafudipekimutixaxedosiwa.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160846792d870d---vujoradijojinela.pdfIn PDF document text
    • http://theemasternetworker.com/ckfinder/userfiles/files/buraxejarexixuguvezajepo.pdfIn PDF document text
    • http://driscollandgibson.com/images/edit_images/file/11410413226.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b564a958fd6---nokexa.pdfIn PDF document text
    • 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_off0000e403.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE403 10264 bytes
SHA-256: 78e2b31af89333491d15abb3bf027024086d05721f9c0379f9c0ec22107b91a2
font_01_sfnt_off0000fb19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB19 17112 bytes
SHA-256: 39e3bee33b151cbb89775b38d9fb901abe2c20a466ea27ae142c3615e986b5f6
font_02_sfnt_off0001279a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1279A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1