Malicious PDF — malware analysis report

Static analysis result for SHA-256 e411cd5d20649e89…

MALICIOUS

PDF

84.8 KB Created: 2021-06-26 02:14:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: adc109445e0af813b7f89bc32d6fda80 SHA-1: dc897da3f7dbc9a19023eb20d29cfb1560ebc811 SHA-256: e411cd5d20649e8948ec3341b7b08ac9e7b086fe25e086d445d6b4ddcbd486c0
156 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the presence of multiple compromised upload links is a significant indicator of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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 http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160d3903421203---lijukuso.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609a06f859f1f---vezokaverukapupatugosituz.pdf
    • http://cayxaotamphan.net/userfiles/image/file/zovopepekutufakobik.pdf
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/mm9rqhdm59lcullkvq2573e7dg/40058124164.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b08cd7165ae---99087566696.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/4690612246e9ba77e24ef6a6dad58757/62651787310.pdf
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab000b8654c---sebotugabezo.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/426a29fa54998d27a1a3b4d70a71d190/71030677310.pdf
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/578aba12b1e965cc80dbdd7adc6e95fe/8229513637.pdf
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/77facf137470607b5c165e486f03e74c/99851140889.pdf
    • http://aeskulap24h.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5426220fc1---zoronevorubetazozonaf.pdf
    • https://noithatkuongthinh.com/uploads/files/vudowununetebudofoteboja.pdf
    • https://a2designbg.com/userfiles/file/monuwuwifubetoxofaxob.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/r463rkg15hqeuttiko2uclfab6/widivoselivo.pdf
    • https://rubenoferro.com/userfiles/file/ziniwezozupetusokonaxadi.pdf
    • https://rajaunited.com/contents//files/tabanuti.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/pfblfj1o703bo58bmsq0e676ue/xatovog.pdf
    • http://servmed.net/userfiles/file/43511818263.pdf
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fdaa7dd976d1db1728c9130adbbf7133/texifisenirexut.pdf
    • http://koszyczarek.pl/userfiles/file/3407706370.pdf
    • http://fairway.cc/images/blog//file/kipulam.pdf
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160769e30055f0---59228486222.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=side+effects+of+antiretroviral+drugs+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_off0000e483.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE483 16792 bytes
font_01_sfnt_off0000fc95.bin
b3e67de67ff23998cb5de08e13ead51dfae37ad1871e5200c15370e916501c50
pdf-font-stream PDF embedded font (sfnt) at offset 0xFC95 17772 bytes
font_02_sfnt_off00012a72.bin
aedf22331eb57ad834c88887ecc58cc1c26853a646df4bcfce74f43c68fdb9dc
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A72 11036 bytes