Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a9b886a999f59e1…

MALICIOUS

PDF

96.8 KB Created: 2021-07-29 21:37:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: fa3cfabad7f30936bcf80a78d6fb472b SHA-1: 0e2947f9094005f23cfe16806e6f1ab3bd7e963d SHA-256: 4a9b886a999f59e1105db1cc5565761233ab86f7315b0b3b0cf0b88b822aa758
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, 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 presence of link farms on potentially compromised infrastructure suggests an attempt to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9653

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://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779bb62fa6e---jironem.pdf In PDF document text
    • http://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/26687555077.pdfIn PDF document text
    • http://steelfurniturecn.com/d/files/tebazuforok.pdfIn PDF document text
    • https://xn--80aaijzh9b.xn--90ae/documents/file/jedijagokaligo.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/25358127310.pdfIn PDF document text
    • https://www.sudburyhighspeedinternet.ca/wp-content/plugins/super-forms/uploads/php/files/4b4a6380a699a22b39a74f44f1c66ed7/7015253432.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/wugopozip.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160944462bb4f8---ginatawudekodagowutenar.pdfIn PDF document text
    • http://thompsonhigh1980.com/clients/4/48/48b9e10b24f1ac3c627dfd5bb8c45987/File/pokogitefivugupav.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/tgaojiudkdst1je938ifcqcmfu/joxujadunajola.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/mn2umg92dqob7596vckt2025j5/sizupedoxefelavo.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/c920c0914523733f7637d7e1065401b4/nomajigowuruxadunidigo.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/8a89c8f40be319d6f5e8d3c800d4a030/35969924903.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1f7cd242f68693c893024111e5b50e46/koxebubolewetuderexog.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/52d6681523cf01fecdd3aee2df244b1b/vafejagutaxazuretudufu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/5eb672dbdc71d7b57903eba25e62d333/mixijuferimekasejulevo.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/puxabisarusojesijudabu.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/tivf2mp67ql8nrm19gia28a762/nosoxelazuturevomisegedot.pdfIn PDF document text
    • http://rc-modeller.se/images/file///widojikidubadomaxo.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091969ac0e52---munozovajuvoroga.pdfIn PDF document text
    • https://nanosoft.mn/images/content/File/27550183684.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b075fd9464b---59935676520.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c481367062---vosodogagitijirapu.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee004aed22---81011196939.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/49750382966.pdfIn PDF document text
    • http://softwarefactory.nl/images/file/pejukovogivuwetipovam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=download+video+crows+zero+2+full+movie+bahasa+indonesiaPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C99 11216 bytes
SHA-256: f7bfbfc17397070db13b2fedf321ce65dc7d88a15c14f342ec19b99149b1359b
font_02_sfnt_off000136b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B8 3856 bytes
SHA-256: a16c9d97c972503f3e52cf454188567fb38e1898f03156f0963e4570501033dd
font_03_sfnt_off000145ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145CA 17360 bytes
SHA-256: 7863f9e41623e0d61f36aa4160e855ff1de5b9aef6eeca32420f747b8d5a4d9b

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