Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc5940fd7fbf916…

MALICIOUS

PDF

156.8 KB Created: 2021-07-03 08:43:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5249f3a302fe130e6bb12f5b9c4151e2 SHA-1: 07d74e7a963bd8da33dccb2ebf89e63e42dd9570 SHA-256: 3cc5940fd7fbf916b6e3b9fd153318dca350133e7bb1bdca86a78dc5071455d1
164 Risk Score

Malware Insights

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

This PDF file contains a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and does not provide direct textual clues, but the overall structure and URL findings are indicative of a link farm designed to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://philabc.ru/uplcv?utm_term=subsequent+myocardial+infarction
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/c4826b061429e71eaf32f7b959f03c87/xigifo.pdf
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/gtcdoe6mahv0kj17l25l0knr0g/68181802478.pdf
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a695cb5c219---buzinajewapunidulanud.pdf
    • http://dmhu.eu/uploads/uplib/file/leweloje.pdf
    • http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c03fa47dd1---resed.pdf
    • https://bjjewels.net/nbloom/fckuploads/file/33468544306.pdf
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6a0d42026d---pibilakabader.pdf
    • http://thedewakohchang.com/image/upload/File/6023096875.pdf
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce83569d97---nadudukarowegofovopeno.pdf
    • http://mazdooradda.com/userfiles/file/xizelutezanez.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/86866ffb5d3dc027a9ae376e68f3762a/54051002934.pdf
    • https://www.dartmusicfestival.co.uk/wp-content/plugins/super-forms/uploads/php/files/b70dd4f8c1566789572738ca7b677791/vizuwoxuvesu.pdf
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/pobori.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607708285d49e---didorubovovinomuvinarumu.pdf
    • http://pensjonatagat.pl/userfiles/file/50123116517.pdf
    • http://korsorlampang.net/user_img/files/35934217123.pdf
    • http://brandnewgoods.net/userfiles/file/miladevomefowoja.pdf
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160acdafccf02f---dubelitodo.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002037f.bin
5ff7909ba777d064edf567cbce4cbc22118a82e26bbf2aaeca8f536a1a2affc1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2037F 19280 bytes
font_01_sfnt_off0002351f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x2351F 16792 bytes
font_02_sfnt_off00024d36.bin
29449bad569a02e8d2c444368b53ae4e58f61651b1c961626c216a32283646b5
pdf-font-stream PDF embedded font (sfnt) at offset 0x24D36 11212 bytes