Malicious PDF — malware analysis report

Static analysis result for SHA-256 1327c1e8e93efb32…

MALICIOUS

PDF

91.9 KB Created: 2021-08-07 09:22:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f7a3a5cb1bb296c97c149eb0018a436f SHA-1: edd814e30b41c339aafd15f113704530ac319dc9 SHA-256: 1327c1e8e93efb325b0d5e0f37f392a877fbad4e273074a118a2a90982a35b10
156 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains a link farm with numerous URLs, many pointing to compromised CMS upload directories, suggesting an attempt to lure users to malicious content. The presence of these links and the detection results strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://szkolka-wiercioch.pl/files/file/18710458954.pdf
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/vsvp4r4er440d9qqecro5c5fbc/zenafobix.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/329a64e00ba4b8f01db7285b8fdee8e2/12213139943.pdf
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/ldd8ruo0ki5fi91m448g117qda/rutabisatu.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/wirejufifajarowomura.pdf
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeeb3ba1b7e---332138808.pdf
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/wowotawejubetipirovorej.pdf
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608206dc4c5eb---valuvomeroxikepiperupiwo.pdf
    • http://nfrostov.ru/upload/files/zilepakawagesaku.pdf
    • http://tvtamminhphat.com/uploads/userfiles/file/pepekidurafebexuxogepo.pdf
    • http://anupbolivia.com/images/files/11111706758.pdf
    • http://dabaizhongxue.com/upload_fck/file/2021-6-3/20210603093244748464.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/1e8d556c7e7975fce2bfcdf2cc3312be/sowikosafavimonad.pdf
    • http://rosesrealtyhomes.com/userfiles/files/mapujolusamibojusaposojuz.pdf
    • http://poexali.org/static/image/_u/system/files/84752932208.pdf
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607cddbb02391---89610227463.pdf
    • http://jsdarvin.com/files/3181762440.pdf
    • http://sola-brothers.com/userfiles/file/jadabekaxokef.pdf
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/df8b6a663f443e0b5f2ae60ca73733d3/dumoxenijetot.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610425ae64f4b---76229265817.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/f8fcab9ced46de7dfa0099e298795e78/80000683036.pdf
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/d273e3c71a18e2eac6c18d7fe83a5ae3/fodogasumevebop.pdf
    • https://fontaine-eva.fr/userfiles/files/ketak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=que+es+anemia+falciforme+y+cuales+son+sus+causas
    • 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_off0001012b.bin
469659f1cd9c32f1c24ae881e04a60f09946555b5633ce7e20d945387b9ae54e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1012B 18404 bytes
font_01_sfnt_off00012fb4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12FB4 16792 bytes
font_02_sfnt_off000147cb.bin
0b7473654a587a50812b0b9f582d85cb3bc2db2c4af97163e3a42ca5913387a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x147CB 10672 bytes