Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef0cc353badf6367…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 00:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99ff9acd3439479db9363275949e11ae SHA-1: ab02db4334c3b1fe48874d5a1491e7db81b05a15 SHA-256: ef0cc353badf6367b06c70ac7e8272fa6eb44a6fef061324525fb67a5c6245f6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress installations. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs suggests an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6837c0c0---72809757491.pdf
    • https://luyenthitoeic.info/userfiles/file/49444631362.pdf
    • http://biomisszio.hu/tmp/xozosagulipu.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607746d396362---68194797621.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b608c868750---48087311868.pdf
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/b2ce237fd2721d1f35f876922f502176/zopitibigevoxipewad.pdf
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/c52d272b9490f04f7d9c1d956c016a5c/66469532702.pdf
    • http://hungthanhauto.com/luutru/files/24697920115.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dbee130b9f---60863275810.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5b40092c0eedf7f385fa12ea3af9ea8c/vagilodo.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/4r57nnefildog8r3hp0vcq5p90/warejugobuj.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607673cd4cd41---7065516268.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/og9kut8r9faat7eug3p5nliu30/jalipojaxoj.pdf
    • https://amursvoidom.ru/media/files/83310700821.pdf
    • https://argumentua.com/i/file/jaxuvejepibigegilok.pdf
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfb18b28c---lakajejawefixip.pdf
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd565331c2---16316683928.pdf
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ghcqnvp5dqtbj7kfajh7rp2np2/lelebixok.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7cc897a69a4e12a10629ec1f39292d1d/mexetaletemuzalakoda.pdf
    • http://reicar.dk/userfiles/file/voniwugozisisizijusex.pdf
    • https://clifestyle.net/uploades/userfiles/file/dakitufegegekisulovazile.pdf
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dad2349f9b---kelonuto.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b403a5a2ea9---geviwufigikonojofad.pdf
    • https://a2designbg.com/userfiles/file/konunevawe.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160b3ef6faffec---75721340684.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=uterus+is+bulky+and+anteverted+meaning
    • 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_off0000f71f.bin
044e9faaa868091214b47ae18974816a7bd6ac2d6a7af7b7715b071a82fdad53
pdf-font-stream PDF embedded font (sfnt) at offset 0xF71F 16948 bytes
font_01_sfnt_off00012312.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 16792 bytes
font_02_sfnt_off00013b29.bin
8361f46e7732412929048d297b273643cc9695cc8f6002ec2cc0eae0bb178bd0
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B29 10988 bytes