Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acca96e06a52a3c…

MALICIOUS

PDF

95.9 KB Created: 2021-06-29 03:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 61c8b8fc89a131d56b0a60d55cd9557d SHA-1: 643d38b0456fc5cee0809fe7416caf1f2ce55bd9 SHA-256: 8acca96e06a52a3c17581983969e5e5902a850a418c4c128738dd80b8f4bdc57
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to other PDF files hosted on compromised WordPress sites, suggesting a link farm designed to distribute malicious content or phish users. The document body is unreadable, but the presence of external URIs and compromised CMS upload links strongly indicates a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9918

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://drafthe.ru/uplcv?utm_term=keeping+a+guy+interested+through+texting PDF link annotation
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b16c7f21c48---larijoganulamavuwox.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2ce36e728894c2878408f166f58047ca/48396689454.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/31281198451.pdfIn PDF document text
    • https://tolgyesvolgy.hu/userfiles/file/nitavawafeworusotuseme.pdfIn PDF document text
    • https://xn--64-mlcufjjaii0l.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/e4f643b3e51a88d5caec22ad48885d70/wofazip.pdfIn PDF document text
    • http://goldmustang.com/files/files/26997932368.pdfIn PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/f08c5fd83c6a23369067c447a9d2f68a/46325989634.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b89f1188cd---zotekefafigumumomuzuxibe.pdfIn PDF document text
    • https://renesens21.com/ressources/upload/files/14723082283.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1609df34c4c352---sezofixibimixedepikaji.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/dapiloliforime.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/74749176825.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609547d7871fd---22149324666.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9e0babfe3---55192000394.pdfIn PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c8c02c56c---68118788800.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/sovivatatusemopodasa.pdfIn PDF document text
    • https://path.mn/userfiles/files/24474552661.pdfIn PDF document text
    • http://bubblesoflove.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b55d99970df---bepoxalipolexazik.pdfIn PDF document text
    • https://jobtiara.com/files/files/17339207489.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/gouhpmp8akkoabr5el9jfvg30c/xotadewevorimitobezive.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d9dc7613f31---80384121740.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d4c17f97032---muromipiv.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aaf8f91032---53469207664.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/a34bcc8e27de2c81dc7706cccbbe4b7c/97639795166.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c88fdb2ff30---37100482382.pdfIn PDF document text
    • 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_off0000fb79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB79 10932 bytes
SHA-256: 9249104e8e107434d7646d9d1866868fc768125e937f67eafb9f8626dc8ab27f
font_01_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 17328 bytes
SHA-256: 80d401900cc2a045bc6b71a949431c71e60f7e26f34cdf49b61025c5f249924a
font_02_sfnt_off000141c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000159d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159D2 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae