Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a74dd453bc8fc9a…

MALICIOUS

PDF

90.9 KB Created: 2021-09-20 01:02:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a9907f4207eae46f00e52912b3c44fbf SHA-1: becd1293c0ac839fc2266c11d0def7eb67daf0ef SHA-256: 4a74dd453bc8fc9abb94bb302e7235a329a23fba8e94bae41f58b4e6da28b571
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on what appear to be compromised or disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 http://alpinist.store/sribati/editor/uploadfiles/5894268148.pdf
    • https://baoyi-chuck.com/ckfinder/userfiles/files/tokodubetaru.pdf
    • http://canadanur.com/resimler/files/37209737526.pdf
    • https://108pizza.pl/uploads/userfiles/files/68544885386.pdf
    • http://knuhpharm.kr/userfiles/file/20210917065527.pdf
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/51741012498.pdf
    • http://bayanairag.com/uploads/userfiles/files/21590195364.pdf
    • https://lecachet.fr/docs/files/fotesepabufa.pdf
    • http://lexuspolymers.com/assets/ckfinder/userfiles/files/71066869032.pdf
    • http://thegioixedap.net/upload/files/vuperanegul.pdf
    • http://tpokebar.com/uploads/files/16692131552.pdf
    • http://asr-net.ru/uploads/files/93543057681.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1613258bf4a1d1---34919732411.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/8180434d5650228499981db53c027fb9/jezifiner.pdf
    • https://milkywayads.com/webroot/img/files/37012323261.pdf
    • http://podiummoda.ru/userfiles/file/92672864865.pdf
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/78385595164.pdf
    • http://chiengthai.com/file_media/file_image/file/bevotodolapokimuwosafor.pdf
    • http://bratislava.topenglish.sk/app/webroot/gallery/files/11985278478.pdf
    • http://oldadmin.k12cart.com/media/files/wuvebedilunorebofixilivu.pdf
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/34778651025.pdf
    • http://hueide.com/upload/files/fikiwukosazuxegax.pdf
    • https://m-astar.com/UserFiles/files/68514648921.pdf
    • http://kerekesvillszer.hu/UserFiles/file/11218146107.pdf
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/6db2a1c119a7efd82598530e6d7854e5/kebazajofejir.pdf
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/he2gmtt5t1a6qrvolutprct4h0/sezuzikubiberejavebanezo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=conjunction+at+beginning+of+sentence
    • 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_off0000fcbe.bin
e226cb50e01f4fb18211e30f6b33148e6c8c1d7b82cd39133bbe31fc9598f087
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBE 18876 bytes
font_01_sfnt_off00012ce2.bin
15c264f6621320372cd762b65d2df008bf32199519108319b2f35dcab86e8a52
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE2 10768 bytes
font_02_sfnt_off000145db.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x145DB 16792 bytes