Malicious PDF — malware analysis report

Static analysis result for SHA-256 98b4d81447624cca…

MALICIOUS

PDF

113.1 KB Created: 2021-09-08 02:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7cc1bcf295f7df07d5fbef1e5028874a SHA-1: 61fa634ca650cd0e6fcac924f1109eef355674e0 SHA-256: 98b4d81447624cca6dea3e5c14f61be22dcefd7eb6ae4487c817860a675a4e27
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to domains that appear to be disposable or compromised, suggesting a phishing or scam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious websites for credential harvesting or malware distribution. No scripts were extracted from this sample, but the presence of a link farm is a common tactic for phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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 https://nomylo.ru/uplcv?utm_term=old+testament+baptism+pdf PDF link annotation
    • https://hashtag.school/userfiles/file/muwevikimatuzuzenevedabus.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/52cf7273c92a54aee29f66b3457514f7/sidowowojajidogenazi.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/4b316d2cdeb713f81d4119d66b66cc0b/75788498359.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/75849624931.pdfIn PDF document text
    • http://jordanfamilyreunions.com/clients/5/51/51534e3e38036466a76ca8a024fd4923/File/magezelotetolevewugaju.pdfIn PDF document text
    • http://indecomavo.pl/inc/belopiduxosi.pdfIn PDF document text
    • http://palami.by/images/file/pelax.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/xotidukifimudedu.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c01c06c65---nunimijeroxekomesuvob.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/dalunirexatiba.pdfIn PDF document text
    • http://modaxch.com/userfiles/files/12667713660.pdfIn PDF document text
    • http://balade-pierry.fr/userfiles/file/77376665824.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/fol1h9mff3c7icj3nl11mso1i3/sokupesajogukexekifa.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/hn9hiofq7r7lsb3hs35ahrd642/39243000857.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/71145927242.pdfIn PDF document text
    • http://avandcie-energy.fr/ckfinder/userfiles/files/2938421783.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/mavud.pdfIn PDF document text
    • http://vantaibactrungnam.vn/upload/files/77239710476.pdfIn PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/suxuboluj.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/nasuzipokun.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/rojidazorerifa.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094d8b951b3c---lerexal.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/6b5e227a500030c3e76f737783edd683/botuvedafem.pdfIn PDF document text
    • http://didongsinhvien.com/upload/files/vediru.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/kijuporokotutedurazo.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/47379028383.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_off00015714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15714 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016f26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16F26 18344 bytes
SHA-256: f7eb3a5b2496aa5c04d7f6729ef21010585a17ecffbb74c5986d69f35052a728
font_02_sfnt_off00019e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E6C 10604 bytes
SHA-256: ca2ca062780172766d3becd2215e41bc7530ae7cbfe91b5303df5562cfc4e98f

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