Malicious PDF — malware analysis report

Static analysis result for SHA-256 4278092a7e7248f2…

MALICIOUS

PDF

92.9 KB Created: 2021-06-28 08:19:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7d0bde576a8470e041c93bd2cf59efd SHA-1: 5d2474092cff344f748465f847ad954f5b4bad44 SHA-256: 4278092a7e7248f2e287bfe0091efef8e4fb98c9fd9031ce650c23797603b120
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload directories. The presence of numerous unknown URLs associated with these compromised sites suggests an attempt to host or distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079e08f97460---dojifijupojuxavokaregar.pdf
    • https://fultoys.com/userfiles/jolemiteninepiv.pdf
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/rc4md87220vuk60o19b0p1mro6/juvitix.pdf
    • https://whiteplacard.com/UserFiles/file/48779011962.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e3daeb4b3---xopajopivezozexazuda.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/a949275ed6825f3d7cb594b128cbd08e/7809293500.pdf
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/16082e46aa8d03---rinesis.pdf
    • https://gradeagroup.com/wp-content/plugins/super-forms/uploads/php/files/ttgdij70quehlsqif528jnkl8b/27070892349.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f180c7e58d---nonarezinilobamukoj.pdf
    • https://medtek.vn/storage/file/dimuxatojiserokopidarixo.pdf
    • http://vladjurnalist.ru/archive/file/desekavubo.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/bb5330b4f50e336e3f747257ec0728f2/25800324802.pdf
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079a5068e881---78246502558.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/zumoramaniba.pdf
    • https://burstallconrad.com/editor_files/file/57166992043.pdf
    • http://ardechetendancebrut.fr/userfiles/ardechetendancebrut.fr/file/gizozesufifilizorox.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e313b17e9---88338658746.pdf
    • http://bbfrontedelmare.com/userfiles/files/50931511001.pdf
    • http://maxtarget.by/ckfinder/userfiles/files/62449278530.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/fulozemipowasesukasif.pdf
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608493820da65---34482779589.pdf
    • http://aksaaydinlatma.com/img/editor/image/file/xapelaputoxalirilovawib.pdf
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d6388c3f8c---bamovados.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=best+teaching+interview+answers
    • 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_off00010786.bin
b54e7266850fe18fe641056f028cfe5522d72f6203586daf3371c283b7e5cb63
pdf-font-stream PDF embedded font (sfnt) at offset 0x10786 17784 bytes
font_01_sfnt_off0001362a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1362A 16792 bytes
font_02_sfnt_off00014e41.bin
152ce21384d7bd905403c1c47e4cf76e48966e63c4e99ac002382589b61a7546
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E41 10548 bytes