Malicious PDF — malware analysis report

Static analysis result for SHA-256 e908c437b3ff8270…

MALICIOUS

PDF

84.9 KB Created: 2021-09-05 18:35:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f84fd6729dd2e65e3540a66ffe90f82c SHA-1: ecc848bd4cc3805f53df93103515184dc8512f10 SHA-256: e908c437b3ff827047e90d01660bb9c2ff1b9f7c8aa079d6833a2f7075d9a203
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yar-net.ru/userfiles/file/fewimasuje.pdf
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/16128ca6452733---5676077272.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609023d291f90---vamusoginige.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/27555788379.pdf
    • https://alianzatours.com/imagenes/file/16753392272.pdf
    • https://cmf8.ir/data/file/79001848904.pdf
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d3af90c6c---mosejojatijaxirapisutu.pdf
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160db27fce863c---nixedebusipisegis.pdf
    • https://pinyardim.com/calisma2/files/uploads/88047299503.pdf
    • http://bukharajohnscreek.com/sites/default/files/file/fujerifipemesegoteg.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/bemozekinem.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984d06027cd---vasokavulure.pdf
    • http://auxerretv.com/content/public/file/85092449969.pdf
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f44e10f2939189e5c9c296ab997adca5/loleziriradejixefokakagel.pdf
    • http://soles2walk.cz/data/file/26896346962.pdf
    • http://fazekaskozpont.hu/images/upload/file/71210077764.pdf
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/ja9l0s4sg3fhhjpag3de5k73ot/kuputaxegoze.pdf
    • http://omonetach.pl/foto/ilustracje/file/56923366867.pdf
    • https://firmabudowlanawalczak.pl/web/uploads/files/34698027650.pdf
    • http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f948468541c---puwok.pdf
    • https://banderlogclub.ru/Files/file/romiferibulov.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7d63e67b4---29814883951.pdf
    • http://homespakistan.net/magzine/uploadfiles/file/xemizavotisalezerozowunu.pdf
    • http://konditsionery-odincovo.ru/upload_picture/file/xawexilenetebib.pdf
    • https://sadex.pl/fck/file/pewuzovawu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=traduzir+pdf+grande
    • 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_off0000e13e.bin
ff800a75a7548b98c20ce66e945e3cc38a67ec325a6555ad39ce1518a2719862
pdf-font-stream PDF embedded font (sfnt) at offset 0xE13E 20500 bytes
font_01_sfnt_off0001166b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1166B 16792 bytes
font_02_sfnt_off00012e82.bin
ddf2637b7c00c3be6f325b59e419e586d906f0d6654b6ddbc5c77f1da6e84b62
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E82 10364 bytes