Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec2d69762eb6d1c7…

MALICIOUS

PDF

81.6 KB Created: 2021-09-19 20:18:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a381b61c0268d92765f878b6bbfb8c6a SHA-1: 35c1b78210a257855005096eda72ecb9942f067e SHA-256: ec2d69762eb6d1c74c8a3c1859c4971d4dfb41c4bfd88bbabc60b960505dd376
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of a 'utm_term' parameter in one URL indicates a potential phishing or SEO manipulation attempt to drive traffic for malicious downloads. ClamAV and ML classifiers also flagged this PDF as malicious, supporting the phishing and potential malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://pixomot.ru/uplcv?utm_term=windows+10+x86+download+free
    • http://goraku-sangyo.com/userfiles/file/2719193686.pdf
    • http://ulrike-mayer.de/userfiles/files/dasedogogunamejik.pdf
    • https://magnanelli.com/userfiles/file/jilikijugekodavemuzesus.pdf
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16130a1d3f30ac---naxumetusijazu.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/wemagilolenukalerukod.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/4acfbb26c8caf27eb30b7c890dcb9a7f/29161385584.pdf
    • http://lepetitjaunais.com/userfiles/file/pipazimoxubegusubebi.pdf
    • http://studiogallerani.it/userfiles/files/motebo.pdf
    • http://liubeauty.com/luutru/files/13747848600.pdf
    • https://consultemergingmarkets.cubsindia.com/files/dodaxuvexebodajirowid.pdf
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/babaxadexoxevizizoros.pdf
    • http://abwingsbuffalo.com/uploads/files/tobog.pdf
    • http://hitmet.slektenkaas.com/bilder/file/39163252715.pdf
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141ffcc17b4a---54246650309.pdf
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/vesekudigixejikakinit.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16134080585795---zugamoleg.pdf
    • https://bnovum.hu/downloads/ralujubu.pdf
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1630654200.pdf
    • https://cambodiadriverservice.com/userfiles/file/gotupaje.pdf
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/gawaratamunekeluku.pdf
    • http://gd-weimi.com/upfolder/e/files/20210906021153.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/f4bc1d5e2f8c010fd32dfc29264a83ff/56587894153.pdf
    • https://stiff.pl/ckfinder/userfiles/files/dakanomedutuwozujipev.pdf
    • http://betheaskssd.com/flash/betheaskssd.com/file/80385793060.pdf
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/mabudaxejenerib.pdf
    • https://casasholidays.com/scgtest/team-explore/uploads/files/66102181990.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_off0000da69.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA69 16792 bytes
font_01_sfnt_off0000f280.bin
f4f3137c91302a3e1e22afd200db1a4a7e7b7d92632b1c9ea1a544864571c9a4
pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 10980 bytes
font_02_sfnt_off00010c2b.bin
956e92c27426ca4a24e79a24444b43b7e81085470aa11429bd0c4965dbd57cc6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 17260 bytes