Malicious PDF — malware analysis report

Static analysis result for SHA-256 687e2a5447bdc4c2…

MALICIOUS

PDF

69.7 KB Created: 2021-09-25 20:22:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d48d5e15fd4282a2b2e45d3979f406b3 SHA-1: a6d68bd3ac61a5300d99c685830433dd4e90946b SHA-256: 687e2a5447bdc4c2d67338dd03135d6157b3e381c86dea88a220c5313cb95788
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable links. The document's structure and the presence of numerous links to potentially compromised websites suggest an attempt to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://elitakhealing.com/ckfinder/userfiles/files/11059346224.pdf
    • https://sakura-bashi.com/uploads/files/202109161100447910.pdf
    • http://kleinschadenexpert.de/userfiles/file/worapojol.pdf
    • http://falconltd.pl/cache/file/boxuleposadurogazogegoj.pdf
    • http://ccswcd.com/userfiles/file/44713100913.pdf
    • http://learnazia.com/fck/imagesfile/52349378842.pdf
    • http://sevenseahotel.com/uploads/images/files/15489260318.pdf
    • https://aarushimukhwas.idealviews.com/userfiles/files/59486943483.pdf
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613bc429e062c---58667714136.pdf
    • https://traveletrust.com/basefile/traveletrustcom/files/walolofirowolim.pdf
    • https://tsydesign.com/userfiles/jws/files/91403455329.pdf
    • http://tortsurprise.ru/upload/redactor/files/32128864606.pdf
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/11902567744.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/ad8da52dfa6a9aba0d426a050d44e88b/55763100366.pdf
    • http://rootbeadmill.com/upload_fck/file/2021-9-8/20210908165356495431.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/iond43sgmivj3e9vonnfffv3bc/zafixezuzedinawa.pdf
    • https://mavismanagement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a5c81a6f81---zawiguduraviwupademosop.pdf
    • http://kssi.ir/public/userfiles/file/nevamufakis.pdf
    • https://rotterdampools.com/contents/files/tabowiboxefufamuwezu.pdf
    • https://steammining.com/userfiles/file/92059565918.pdf
    • https://resortweeks.pro/userfiles/file/83621978530.pdf
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613a966411a63---21946212439.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d31a8ec932---9030165722.pdf
    • http://tjsyjdq.com/v15/Upload/file/202192819289604.pdf
    • http://lactopad.com/uploads/files/rawawesutomevinuzafutifu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+torrent+site+for+malayalam+movies
    • 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_off0000b48d.bin
4fa2e358aaab071dc975e4588819b882912b13479bcfea474115fcc628c1ad35
pdf-font-stream PDF embedded font (sfnt) at offset 0xB48D 14356 bytes
font_01_sfnt_off0000d858.bin
b7253c9cb781b75260f7eb502a3dedcc5c49cf835748d6dcf329a2523b0cac35
pdf-font-stream PDF embedded font (sfnt) at offset 0xD858 10608 bytes
font_02_sfnt_off0000f0a7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A7 16792 bytes