Malicious PDF — malware analysis report

Static analysis result for SHA-256 aca0739f875015b9…

MALICIOUS

PDF

124.6 KB Created: 2021-06-29 11:46:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 94857bc00a804b340a9a0bbb242bcf7a SHA-1: c1bd0dd61ea7241fe213071a62a57bd0aefe4787 SHA-256: aca0739f875015b93dcd946b2873d51ce0017bb5dd822400009a1fb0d94c2be0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9727

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 https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/eu422tk1ebr6pji1ub7740rpa3/1995480608.pdf In PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ea3897ea3---pojejakilukufusevum.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/60vjgmt1pri7e6e4oqqhftq3b4/vijexoditanugosad.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/liripinorojiribelopomekix.pdfIn PDF document text
    • http://alexhofford.com/temp/files/file/lenanamagogofakeda.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/tifaloje.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/98060955605.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/jilusezasebu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608559f3651ee---72472650820.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160807935db8d2---57188277358.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/raxamagupelerakejud.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/khef4g2ph0mel62oi5smiftq52/sezujogakuxubuzizuxura.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/20216291453184453.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/sawavu.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85a8c14f4---bamegow.pdfIn PDF document text
    • https://www.hauptsache.cc/wp-content/plugins/formcraft/file-upload/server/content/files/160bd3904e82a5---71465301757.pdfIn PDF document text
    • https://amsteroverseas.com/ckfinder/userfiles/files/wapelu.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608615fea1022---jometasixasabuduroxibob.pdfIn PDF document text
    • https://lamthong-marchph.com/piceditor/file/42513156698.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/74425924054.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2cad884eb8---75042524161.pdfIn PDF document text
    • http://federalwayhighschoolclassof1970.com/clients/8/8c/8ce2019516a67423f07d8eefa67dd611/File/23621031821.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/6nvp5c55vu4efup5gvard8kpo1/faparozitujiwotadugif.pdfIn PDF document text
    • http://nfc.soo.jp/file/40770388918.pdfIn PDF document text
    • https://ghnservizi.com/file/86402234613.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/6dc90a302a6ab454e73a67efbafdf423/34793531301.pdfIn PDF document text
    • http://highlandlynxotic.com/clients/7/73/73cf6ae24f8ea70eb1cbac1dff6b0f9e/File/joripiwilozilizolodem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=the+moral+bucket+listPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FC4 17720 bytes
SHA-256: 2ef710dc5a530aaacd24902c4787341f300ff5c325a553bf6d612576785cb19c
font_01_sfnt_off00019e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19E02 10684 bytes
SHA-256: 85e5f4f2b53c04bb715021091730f58439978fafe8477baba38c15f0e263d3ff
font_02_sfnt_off0001b681.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B681 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_03_sfnt_off0001cc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CC8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1