Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b9b61d3cfab9e5c…

MALICIOUS

PDF

118.1 KB Created: 2021-07-05 15:16:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fdb1d466a6eb364e7bed0ab08e6b3bed SHA-1: fd0d4564d4da47bf1b0f03262182b9eca41e9a8f SHA-256: 8b9b61d3cfab9e5c05cabe3005d700391dbeeb88924f634055426cb188d04050
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as a link farm pointing to compromised CMS uploads and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs suggest the document's primary purpose is to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9689

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://hitecds.com/userfiles/file/47196222787.pdf
    • http://mamam.by/upload/File/file/rakinakozekojusepoxivijal.pdf
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/c9562fee732ff22892b3ab77f9207cc9/zipane.pdf
    • http://physocare.com/Images_upload/files/ponade.pdf
    • http://akinmedikal.com/uploads/file/fojutijolujubik.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/uso089ks7sdsi8brciuv9k6704/sufuvofer.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/agaqe889g3ojpsgrmrdb1sv879/54642202378.pdf
    • https://foundryindia.org/userfiles/file/mesivopuzav.pdf
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b066071f45---bafotowukoke.pdf
    • https://refour.dk/wp-content/plugins/super-forms/uploads/php/files/5893c32fc5e995336d01175af9676bc7/74335949612.pdf
    • https://cplastik.cz/data/cms/file/ruxobotok.pdf
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/xumepesafimozo.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/53b456d0658a10c2be6573517d0ee7ec/97149446802.pdf
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1607018ceb9e14---zobezajotifokivedowafixez.pdf
    • https://chmelo.hu/sites/default/files/file/buveke.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c69bcebbfe---90763630586.pdf
    • https://q-web.ro/wp-content/plugins/super-forms/uploads/php/files/dbo5q1j7idekd2v0gvqqlcho75/fosolumuzutozarunowumuwe.pdf
    • http://arohitourandtravels.com/userfiles/file/sogijus.pdf
    • http://dichvutheapec.com/upload/FCK/file/58693497545.pdf
    • http://royalgroup.at/tmp/bexaruxezege.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/dc1ca420ec4e8c666b288e5a78bc9658/99042949693.pdf
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/89253373486.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a29f49a4d79---nidakegajexaxib.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e295e7735---48796724972.pdf
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/1548339f8b8ffa44ab3e6cc230f2ad1f/15090846863.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=meaning+of+sextuplets
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00019483.bin
d9f5e66163d907df9b2c2f031b8906ab183602eda4757f3e8ef428a9cf922d60
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x19483 18328 bytes
font_00_sfnt_off000132a1.bin
10c3cdd33d18be2734bfc96b56b63da8f3fe4ebe2405e8565b8bcc77128738ab
pdf-font-stream PDF embedded font (sfnt) at offset 0x132A1 24432 bytes
font_01_sfnt_off00016e8c.bin
a8161c2f5ba9235eb51b4fcc43b6bb219725019365cb8d38f9ec25dfe5ce54ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x16E8C 3464 bytes
font_02_sfnt_off00017c0c.bin
60273c3ce132ef83a4685b8c4e51b3e11261d0d2ca2e456768e5f084e6d61c3d
pdf-font-stream PDF embedded font (sfnt) at offset 0x17C0C 10628 bytes
font_04_sfnt_off0001b224.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B224 16792 bytes