Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5d050300caca34…

MALICIOUS

PDF

80.4 KB Created: 2021-08-19 23:23:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 93974f5b2a9920421c9aa1066dac2833 SHA-1: 43edb09cbdd34c06e4a912c8111feb1f74814821 SHA-256: 1d5d050300caca34d6211dcb8ff30f191a6f427708798290f1fec280280a3216
156 Risk Score

Malware Insights

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

The PDF document contains a link farm pointing to numerous compromised websites, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, but the structure itself is designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://lotusromeo.fr/app/webroot/files/userfiles/files/xukazelekakibepapu.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/fec9e7f9869188eb5a0737c19b5b4ed8/fozebudubifijopibabaxeg.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4424fu8jfl9mq9jrlpprgkusk1/jedapalazobojirer.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16100a09427aca---73367930484.pdf
    • http://anhuizhkj.com/upload_fck/file/2021-5-2/20210502020547579542.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/1cff2ac513bd23e38cd0ae9937bd8c2e/64857389801.pdf
    • https://angkoronetour.com/userfiles/file/fumukim.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/423c0e49c07a0490ba93febbe41e4136/lipitodovixafifoxozunisu.pdf
    • https://pharmnet.cz/ckfiles/files/files/70028262829.pdf
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/26121130567.pdf
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/5ddac14870a543525c6ac0bd594795ae/22805555138.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/5cmoi8cr2ta7m6csjlu6jc5n55/loxotozuwo.pdf
    • https://kme.pl/global/app/webroot/uploads/file/16273038682536.pdf
    • http://pusancard.com/userData/board/file/49638032094.pdf
    • https://a1-recruitment.fr/v2011/Files/fck_upload/file/27865738233.pdf
    • http://lawyerstitleescrow.com/clients/9/9b/9b7cfcecb5e5abb6b877b2b1d59b4eb1/File/woligupogidi.pdf
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f10cb4f17ec---50084671891.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/m8dljj0i70dbnuiuajtpp0unh6/fupasuluwe.pdf
    • https://landbondcorten.com/attachment/file/aadab5e02aefc354cb87be40b745ccd2.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b55b488b235---91634144005.pdf
    • https://szekszardportal.hu/userfiles/file/lovijokajaz.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=what+rivers+were+part+of+the+louisiana+purchase
    • 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_off0000d770.bin
e2f76a134dca5a12a3323e447d9a6a978af63df00d996c6c134c4520ae2c99d1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 16828 bytes
font_01_sfnt_off000102e4.bin
31386cd960a1d7105c78ed20a955ed8c0b27183e11ed22f51bdea97d674937c9
pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 10820 bytes
font_02_sfnt_off00011be2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BE2 16792 bytes