Malicious PDF — malware analysis report

Static analysis result for SHA-256 f983b1983a4705da…

MALICIOUS

PDF

72.2 KB Created: 2021-10-02 21:59:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3ca7235d469a1ad1d6d745a08df83195 SHA-1: 2d247c16799371881806ecc4b46916d0385e2042 SHA-256: f983b1983a4705da8e856e99f1bc5d7939b18bbf398d025de5ea5b6341f4b790
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 WordPress installations. One high-priority link points to a PDF hosted on a suspicious domain, indicating a likely attempt to deliver a malicious payload or conduct phishing. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9915

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 http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/hn2ahofhk6fbe4i7i53fm2du34/88885661169.pdf In PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/88800308348.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/puvudifumazupepidixobu.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/180410034270.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/51119554814.pdfIn PDF document text
    • http://mijinmotor.com/fckeditor/userfiles/file/romovum.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/zosubisunosuva.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/xulivopezerimonakusobiw.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/6774577615.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/ed4369eb708ade4059a502bd78dd28e7/midowogu.pdfIn PDF document text
    • http://medica-eg.com/userfiles/file/41145641264.pdfIn PDF document text
    • https://etimes.mn/uploads/files/75932654856.pdfIn PDF document text
    • https://sieuthigo.vn/upload/ck/files/66694783551.pdfIn PDF document text
    • https://pre-www.bridge-academy.com/uploaded/ckeditor/files/nasimujuzotal.pdfIn PDF document text
    • https://sofanet.ro/ckfinder/userfiles/files/vovigobisapinimurogowo.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/61952095276.pdfIn PDF document text
    • http://le-bouquet.be/userfiles/files/fifuzoxuwakadisukiwa.pdfIn PDF document text
    • http://sushinamu.com/uploads/files/doxazoxubet.pdfIn PDF document text
    • http://xfswchem.com/upload/files/93634247606.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/1913039399.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/95835722564.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/ziposizenizapomobewenov.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132ccaee8d9a---49423481207.pdfIn PDF document text
    • http://kbautotech.com/board/datafiles/imagefile/ketajeraku.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/wotumitobur.pdfIn PDF document text
    • http://conniecorsentino.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nodulisus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=riddler+riddles+and+answers+gothamPDF 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_off0000b624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB624 17208 bytes
SHA-256: 05307342951962420f02173b675550ee705882d1b17aab40459a0c2d02dbfb99
font_01_sfnt_off0000e266.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE266 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10824 bytes
SHA-256: eb31cd22e979d3bf9320f8b363e2589a8c8eb2eed63c1d9688ef9526794b8ffd

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