Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8a1fa9e49b7930…

MALICIOUS

PDF

71.6 KB Created: 2021-07-01 18:15:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 42ea26ed53dbf7ee81fb02f0862296c0 SHA-1: 69f6ba3be0b4770c02ed6dd5c4c0152610a60baf SHA-256: af8a1fa9e49b7930a4679bf9b04b369a2fe0ba04ad97719d435603b900a03cc8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://coretry.ru/uplcv?utm_term=definition+of+endosmosis+and+exosmosis
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/0e54203c6416b596ecb57b808ae14fb6/97939719371.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/6ce2fc150e657a8ac3813305e5347309/susujadeworokafijavos.pdf
    • http://bpabv.nl/uploadfiles/file/xeramosunimubog.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/d424938878bbdd39aa93576585c7ea0e/32393371532.pdf
    • http://bright-inter.com/file_media/file_image/file/kusitumaf.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2553b0ad0f---59226110503.pdf
    • https://gadd-asso.org/userfiles/file/87430912504.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160789cf47c794---loranebupik.pdf
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/3affcb61df952d1476eecce83a45dc42/10403545996.pdf
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/frjqr3qi44v7g933kvqoilsq8h/walezewozopeguva.pdf
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607166644d958---26893318340.pdf
    • http://stlnsk.ru/uploads/file/woguxazeriwonefanekegotaw.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160913e0d90079---selupaxasi.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/srai5tclhe61239b706jneoeq5/fikawesaloxotu.pdf
    • https://alarrabnews.com/images/content/content/file/nevabudurexiv.pdf
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d66eaf658---95171837506.pdf
    • http://textingrights.com/userfiles/files/11086487390.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a44411e077a---45731968021.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/b4dc626380c5869bd9b5253f96c9f65d/98624822583.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16082115faee45---fofebutovobiroga.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/ae2be8a24df61da13373fc1ea41d3d7e/rezelimitukamelarile.pdf
    • https://alshaabcoop.com/userfiles/file/lewimivopetonuwud.pdf
    • https://poolpoint.be/uploads/file/8840005670.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_off0000b47c.bin
29bbd4e6adc8122299c5553ce540e94070fd6a48c1000bb52517234664040e78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB47C 10472 bytes
font_01_sfnt_off0000cc4b.bin
9fab43555a137ab19fb2dbd72210ac48c980314419e597af85c9bed58d3604c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4B 16524 bytes
font_02_sfnt_off0000f710.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF710 16792 bytes

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