Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecfa6d0ec9a6d054…

MALICIOUS

PDF

75.3 KB Created: 2021-07-05 19:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4b32f33aa1b770401f37f8707a6334c0 SHA-1: 0fdf3151e519bf8f0e2cc55ae7748d00165c8ee8 SHA-256: ecfa6d0ec9a6d054cc5abdb1904bae96eca6732a5c9a3eb5ff3a3bbc7efad13b
156 Risk Score

Malware Insights

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

The PDF contains a link farm, directing users to multiple compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious payloads, as indicated by the ClamAV detection of 'Pdf.Phishing.Trojan'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous links on disposable hosting and the use of UTM parameters suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://www.drserapkagan.com/wp-content/plugins/super-forms/uploads/php/files/la9l9v3so2jojp50obbmdedi58/rimozorezizodonajuv.pdf In PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/487c9bed8e054fa3fdb389de1b3b5521/42883108575.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/31062906919.pdfIn PDF document text
    • http://alituncer.com/userfiles/file/molaxisavulevarufo.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/h9om05ra5rk7ddtaab5bgqm714/48367985896.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/3h1u73iupr5fhpg2baa7qb94c7/8824859006.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/md8agmc86iq5ntpvgsvh817ea7/98021593131.pdfIn PDF document text
    • https://sibconsulting.com/contents//files/84409586848.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/vabunogix.pdfIn PDF document text
    • http://sgpeo.pl/users//file/95976037593.pdfIn PDF document text
    • http://mjsolankifoundation.com/fck/imagesfile/narewopotufitilolojosake.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210526192322_1931141800.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609c35777598b---suserupetogaxa.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/xisedutelagered.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/gasobusas.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/zedilanav.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16085d93e2fc42---kirudigidoforipozo.pdfIn PDF document text
    • http://merwepizza.com/upload/file/76169534271.pdfIn PDF document text
    • https://nbtele.com/en/cache/fck_files/file/97265618572.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/wadesakitagutiraxilewe.pdfIn PDF document text
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcda347d5d---zanorasoja.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86e1395464---17657386031.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/60544526609.pdfIn PDF document text
    • https://hogies.com/includes/template/uploads/file/zanozuvexozodiravutag.pdfIn PDF document text
    • http://brmhn.com/userfiles/file/20210522045242_d3blgg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=history+4th+classPDF 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_off0000c62a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC62A 10276 bytes
SHA-256: b2c4c6a3728fc39a2382d0264dfd78e7ba47d606035da67e602ef2115e6d2290
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 16364 bytes
SHA-256: 5c119a1c0be21611652409ace02a1fa8b1b625f95663a798fef1bee64992f019
font_02_sfnt_off000107ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1