Malicious PDF — malware analysis report

Static analysis result for SHA-256 94961f438effe471…

MALICIOUS

PDF

83.7 KB Created: 2021-09-12 06:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fbab3ba955d4f39618a9fdb1189d2bc9 SHA-1: 572e5df4fe9077a32ea74e291924dd45ea4bd264 SHA-256: 94961f438effe47115fa7f001c4cb538f42007d5b16ef33638e9189a33224228
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an intent to redirect users to malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.adoz.cz/ckfinder/userfiles/files/10246817071.pdf
    • https://banghenails.com/upload/file/mewizuwoxeziwalav.pdf
    • http://moonlightmontessori.com/upload/files/71669585081.pdf
    • http://www.hz-kontejnery.cz/ckfinder/userfiles/files/bulovifepolusevubixudi.pdf
    • http://kechengchem.com/upload/files/nezobivumelifaj.pdf
    • http://www.majbrno.cz/uploads/files/woruwofajusawejabale.pdf
    • http://metallpress.ru/files/supobopaxeluguvakek.pdf
    • http://aal.tw/uploads/htmlupload/files/batabesowurela.pdf
    • http://phucuongplus.com/upload/files/lefizibot.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613785af9b587---levemezokunifu.pdf
    • https://quatden.vn/webroot/img/files/86054464180.pdf
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/88bf8440fa3797885e2e4e8461908b50/pakasotomitabuxikibod.pdf
    • http://abwmarlboropike.com/uploads/files/18732048871.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139938591547---nowexafuzawifutaj.pdf
    • http://mikailang.com/userfiles/file/20210904202842_1263962218.pdf
    • http://www.allatpatikapecs.hu/images/file/gabukenimanarabigoxeb.pdf
    • http://studiogiamberardino.it/userfiles/files/34788441722.pdf
    • http://phoiinnhiet.com/images/uploads/files/tigupazubeg.pdf
    • http://color-gateway.com/userfiles/file/nixemoduwerevajogafep.pdf
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa2200799d---kuriderovosuf.pdf
    • https://sainaudit.mn/File/bemakejex.pdf
    • http://dedanskecasinoer.dk/userfiles/file/poxelofobusabi.pdf
    • http://hpcad.pl/Upload/file/fizalizi.pdf
    • http://n2nnetworks.com/files/others/41601143764.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=calculator+kotlin+android
    • 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_off0000e12a.bin
371585a17d9706593eaed05e18039bd31cb9db67bf6fe2f42df7211cc1da91f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 19068 bytes
font_01_sfnt_off00011223.bin
40a60688deba7460a27949db725a2f653a3c6b32c5a1b4ab136fd1a3ae368748
pdf-font-stream PDF embedded font (sfnt) at offset 0x11223 10288 bytes
font_02_sfnt_off0001296a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1296A 16792 bytes