Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9ae464f499c08bb…

MALICIOUS

PDF

176.5 KB Created: 2021-08-04 07:30:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: ea313ed1b41d2f6b38081b5b0fd533f7 SHA-1: b8870e7efaa21c66b213dbcf2a9aa4dbc9263322 SHA-256: a9ae464f499c08bbe4bddf61a46d3c8c30ed5b56fe275969f3963aa801026d64
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. These links are likely intended to redirect the user to malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9519

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=organic+chemistry+john+mcmurry+7th+edition+solutions+manual+pdf PDF link annotation
    • http://cisseo.net/userfiles/files/nagexagiduxugirugasap.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/vodagofor.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/gexudalexanikotowekajized.pdfIn PDF document text
    • http://anpo.vn/upload/files/93169442952.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/620321434bcf5202d7144de4106c9995/3873153240.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160970a57daf1e---nexaz.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/gawizabu.pdfIn PDF document text
    • http://luxcottage.ru/stroykamen/userfiles/file/fidibem.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/ftr72ibr2lhrbfj20ulibm5js0/rejib.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16084f44bcb36e---kepokokaronoluni.pdfIn PDF document text
    • https://associazionemusicaviva.it/uploads/file/tisosomuvusofe.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c575c5ca40f---xekexuged.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/19011536652.pdfIn PDF document text
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/7cp26d7f5li3ckfqhbcf86gs22/xawitifobaf.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/50962686051.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/d3329qppddmhsovlfkgq58vhu4/68109871394.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/e2lnmpn1qe41ajf9v7o5aek6k6/fekurom.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7c14188ad---46882662925.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbdbcc30cf---zasovumivavutigina.pdfIn PDF document text
    • http://cesmclassof68cheyennewy.com/clients/82478/File/62926400485.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/nugedisepixif.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/nukop.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/jamavowabotowagawib.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/96731722484.pdfIn PDF document text
    • http://areawifi.com/DESARROLLO/userfiles/files/1419639196.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00022c13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C13 16072 bytes
SHA-256: cab8ceee6dea85bf437db9fdd562b8a0aef74c4066cefe7f2a83a632bdc35db7
font_01_sfnt_off00024120.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24120 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00025932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25932 23472 bytes
SHA-256: 89fabc2f8cfe1569294bf2c2decde3651d4b3c26d0b362f231e2b38497a232c8
font_03_sfnt_off000294d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x294D5 11484 bytes
SHA-256: 2573fbc12fa1c58f2d3e1c07a6ff321a77b31bee39c2ab43a91abc40b7097a3c

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