Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a6aca814f6bd16f…

MALICIOUS

PDF

85.5 KB Created: 2021-09-20 00:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 84a2b25191fe023867294f6e43dadc49 SHA-1: b156717aae5f7622be2999fb172385243db8ba91 SHA-256: 9a6aca814f6bd16f1606d0a7f77d8c7741ad15f197362f99e95f21fcdbeb0e90
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to direct users to malicious content or phishing sites. The document body is unreadable, but the presence of many external links indicates a primary function of redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=how+to+make+keylogger+for+android+in+kali+linux
    • http://seatraderhk.com/userfiles/88244504477.pdf
    • http://beijingxinzhi.com/userfiles/file/20210901052306_2125871976.pdf
    • http://kibunajcc.com/ckfinder/userfiles/files/78343399119.pdf
    • http://americansemitruckparts.com/d/files/12098528071.pdf
    • https://permargi.com/files/galeria/files/96727123848.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d7a2109e75772ddbbd1608cfbe49d761/safamojureru.pdf
    • https://oglethorpeclub.org/~oglethor/UserFiles/file/682253877.pdf
    • http://jayeonrak.com/upfile_editor/2021/files/55128327782.pdf
    • https://infrastone.com/userfiles/files/puwud.pdf
    • http://vin-baietii.ro/ckfinder/userfiles/files/74998380330.pdf
    • https://oxfordjsr.com/userfiles/file/xunowagades.pdf
    • http://rungrawin-itt.com/userfiles/files/60176238071.pdf
    • http://julianowka.pl/ckfinder/userfiles/files/sevunokadi.pdf
    • http://mega-treid.com/userfiles/files/10694864190.pdf
    • http://tunglamgarden.com/images/fck/file/50272505063.pdf
    • http://ferrogep99.hu/static/media/file/55187948326.pdf
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20903836217.pdf
    • http://gimnazjum-krasiczyn.pl/img/userfiles/file/63486982902.pdf
    • http://beloezoloto.ru/userfiles/file/75402471050.pdf
    • http://odessawa.com/userfiles/file/75974808184.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/772c6e8ca3b1081b0240907e47a0ba4d/94734867749.pdf
    • http://imdmotors.com/uploadfile/file/2021091404522674.pdf
    • https://tainandentist.com/uploads/files/202109080443246323.pdf
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b13d6f6b4---seveninuv.pdf
    • http://gabortech.com/admin/file/litifoxokoj.pdf
    • 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_off0000e68f.bin
238821f72bf5a37ecaccb80708c85dd97ffd7f73a85dc7fb78bee7b5c90fbcfa
pdf-font-stream PDF embedded font (sfnt) at offset 0xE68F 18504 bytes
font_01_sfnt_off000116ab.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x116AB 16792 bytes
font_02_sfnt_off00012ec2.bin
91c577473668ddacd131823e4cbe436f42969c1f1fce4b28e47c1237d3495e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC2 11016 bytes