Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c9e68b24c4acf33…

MALICIOUS

PDF

91.4 KB Created: 2021-07-26 05:53:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 921dcda9e1dfec9164fc470a6a5ac416 SHA-1: aeb25d4f4ce0e7d1fb86343a66ccd4b2dca8f450 SHA-256: 1c9e68b24c4acf330d29fd84286598133fc4bf19af56ae794b2f72c2e14e9329
156 Risk Score

Malware Insights

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

The PDF document contains numerous links, many of which point to websites hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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 http://abnicum.com/files/file/58374878594.pdf In PDF document text
    • http://clairerolo.com/userfiles/file/781249895.pdfIn PDF document text
    • http://aryajob.com/user_upload/file/68592063026.pdfIn PDF document text
    • https://www.propertyfilevault.com/wp-content/plugins/super-forms/uploads/php/files/939de147a1290ad5b08b472a49b45d32/puxanazer.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/durodeketuvuk.pdfIn PDF document text
    • http://arlingtonhigh1961.com/clients/e/ef/ef36f0800c0a5d5a0b00d5ecc8c3c6da/File/fasovoxuvijapegexejalub.pdfIn PDF document text
    • http://baohanhranghm.com/upload/img/files/15118953148.pdfIn PDF document text
    • https://traveletrust.com/basefile/traveletrustcom/files/vuvonunewe.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ccb895186---lunetuna.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/89631231619.pdfIn PDF document text
    • https://arerp.kr/data/file///36357495537.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/4325660473.pdfIn PDF document text
    • https://ctners.com/ckfinder/userfiles/files/venaleruruneruremijizizu.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/xowokewozegadovogumi.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7cf79b186---kadezobaji.pdfIn PDF document text
    • http://kiapelhrimov.cz/UserFiles/File/53544165107.pdfIn PDF document text
    • https://laatjehuisweerstralen.nl/upload/file/93447743370.pdfIn PDF document text
    • http://marthomaiticherukole.com/userfiles/file/fijemomuv.pdfIn PDF document text
    • https://himalayanthailand.com/image/upload/File/lafopimupiwugivagonovaj.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/kodijazi.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/8a3c8f04c97799b00a3e4dca17287339/53765341125.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d369a6cd27---32298463386.pdfIn PDF document text
    • http://koreaseals.com/ckfinder/userfiles/files/2116186488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+much+is+a+netherland+dwarf+rabbit+costPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001003a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1003A 11060 bytes
SHA-256: 6890929e23d47a45c9fbfb7d38992c3e28543828029e358c2a8025d83fea07dd
font_01_sfnt_off000119ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119CE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131E0 17268 bytes
SHA-256: bca9dcd84dfb310760cd6aeb0a17ed18ed790ac2377ab9d7b1dde9eee4212b51

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