Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b70e2e0e5f2888a…

MALICIOUS

PDF

92.1 KB Created: 2021-07-04 13:06:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a1e679596386061e59cf4987548700b6 SHA-1: 2abccec9d2900d4fde4f8408bfcfdf9558718309 SHA-256: 5b70e2e0e5f2888a9ffdfaea8ade09818f36318c82b9528a9961e4d638c54c07
176 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the heuristic firings and URL analysis clearly point to a malicious link distribution pattern.

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://huntic.ru/uplcv?utm_term=mucus+in+lungs+meaning
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/f3fff34c51587ac2811249541db68cc3/pawokavag.pdf
    • http://rauvuonsach.net/images/uploads/files/86017985205.pdf
    • http://0851gay.org/userfiles/202106file/2021062009422770554.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/alcrgd1onnscesk4bik0jaaok7/92436181587.pdf
    • https://accuratesearch.com/userfiles/file/zedepamuwirixizujul.pdf
    • http://solamsys.com/userData/board/file/sawarikalipobujijavokubeb.pdf
    • http://xn--l3cbpp3gh4a5g5c.com/userfiles/files/50549599569.pdf
    • https://fajanav.com/aym_image/files/dotomuvaje.pdf
    • http://osteriailgalloelinnamorata.com/userfiles/files/dititawomamimasa.pdf
    • http://zulassung4you.de/bilder/file/fesekexudopagebumuwokili.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/n4m9h0sksk19pah77kv048ba2s/xifex.pdf
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/jqb64jjqimldhq8bujgnkm34kq/xuxalog.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/4e9b2be6be91490121f3d9913d0ed057/bibojulugido.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewupupimal.pdf
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16093a472cb3e6---vofatufefaxat.pdf
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bde3c7a8e83---51479010004.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5025507bb---rekawuzunexomuvuluxi.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608556fbdaf3a---xikesenukamitolodasid.pdf
    • https://rpitrade.com/ckfinder/userfiles/files/72066290202.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ngphleb0hbt0365o7bsvn9i41r/53200138067.pdf
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4df7a5e03---73753266298.pdf
    • http://01host.ru/userfiles/files/dowavidukuw.pdf
    • http://drironcat.com/images/file/xirunokin.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_off00010831.bin
1be4ca4a2da691eb45d0c714146901e6d28a1250d3230ea09f390f3bce0db7c6
pdf-font-stream PDF embedded font (sfnt) at offset 0x10831 10348 bytes
font_01_sfnt_off00011f7b.bin
4471c6a3741c6abfa981f15fa2d2ee164c83910cd42171044c0cdfde17cdd654
pdf-font-stream PDF embedded font (sfnt) at offset 0x11F7B 16936 bytes
font_02_sfnt_off00014b76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14B76 16792 bytes