Malicious PDF — malware analysis report

Static analysis result for SHA-256 b24656d099902368…

MALICIOUS

PDF

86.2 KB Created: 2021-06-30 02:26:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1b40f6d53ac807efeed6e0dac7282d40 SHA-1: 8401441a48840ecd6cd8aaccf17aaa2b17f42d84 SHA-256: b24656d0999023681bf70a94f0cadc836838b8a16eab05ed132bac777f88c199
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to distribute malicious content or manipulate search engine results. ClamAV and ML classifiers confirm its malicious nature, likely as a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://podlahypilat.cz/admin/file/lekataz.pdf In PDF document text
    • https://gservicepz.com/wp-content/plugins/super-forms/uploads/php/files/460c81725dbc0963b0106fd36b1c5220/vodomanefuwidozatixirupit.pdfIn PDF document text
    • http://dulwichtaxi.com/survey/userfiles/files/kajowiguvixusizap.pdfIn PDF document text
    • http://ekotop.eu/userfiles/file/86017976452.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/basodunazaz.pdfIn PDF document text
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/8f1e751a21f1942d0cdc480f85bc1b72/vilurufivuj.pdfIn PDF document text
    • http://norilskgu.ru/userfiles/file/bunuvazosegipuje.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/52aa5c0546f4b7d1746dd0045ae31542/75869542493.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/29464a1679cf936fd7dc565d06b42537/wemafevi.pdfIn PDF document text
    • https://jurad.eu/files/file/73157855109.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/1609dca68eb577---tofapokovavemeza.pdfIn PDF document text
    • https://www.nuyew.academy/wp-content/plugins/super-forms/uploads/php/files/53936c5579b269b45caeb75ac13764cf/darusuminefajemikulevim.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcc1094bd7---6067425434.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160d3313c9df79---bebofomakaguda.pdfIn PDF document text
    • https://capecoralliving.com/media/file/6062395243.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c20f6458ead---20200167613.pdfIn PDF document text
    • https://erdemlerkoleji.com/resimler/files/93023929333.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e45eb6b525---zilaparirinepuse.pdfIn PDF document text
    • https://108pizza.pl/uploads/userfiles/files/21494927320.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/81ofp109b9kp8i5j31mh5j9d7j/74026869633.pdfIn PDF document text
    • http://wonikqnc.com/upload/editor/file/1622183585.pdfIn PDF document text
    • http://goldnumber.info/userfiles/file/surasavupumi.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac35270636f---21035607166.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/16da77a852d848a76c49d6d738ff5875/45633480798.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/fesuwegavugopegagux.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=which+one+of+the+following+is+a+nonrenewable+resourcePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 10932 bytes
SHA-256: db1ae5c68cd4557e517adfdbbab7e17842f02b00ebf9ce860608f397081a5e15
font_01_sfnt_off0001073e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1073E 16752 bytes
SHA-256: 06cf7229e2c3b60bd87ea8f8c5ab0dc7d827f336fc31bf0044b9856944ddf6bb
font_02_sfnt_off000132ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1