Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a6747e231e9c4d…

MALICIOUS

PDF

70.0 KB Created: 2021-06-26 10:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 3e92010817df7a08eb9dfa1a0dc88664 SHA-1: 0bd168424041b2e55e938ed48b3ef02c5f7f0303 SHA-256: 88a6747e231e9c4d1e17c954735560d162cbf384939a598b5c68da0554a1019b
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve to redirect users to malicious content or phishing pages, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://alhouti.com/userfiles/file/46272572908.pdf In PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b697cfe4---84638654033.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160779dcd93e76---65158480089.pdfIn PDF document text
    • http://trendymamy.pl/userfiles/file/rovazulitigejuzipo.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/160a73a504d03f---zovunel.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bb3710b1c83---66663285971.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/bepimadagosowudogulezesa.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/98072060512.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/tusolizadiwaxexo.pdfIn PDF document text
    • http://intergeored.com/upload/File/18289159644.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/b4a21f9f57610718ddc75ec9f295ba07/21656981313.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16093f56b38fe1---dutub.pdfIn PDF document text
    • http://asja-doll.ru/userfiles/file/89775677346.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/0qrq86msb5q4lbajkvuqtt8b3c/24991217868.pdfIn PDF document text
    • http://taeguektour.com/FileData/ckfinder/files/20210529_169E2D36C88FFD76.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c25eaf91e43---42574187931.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/0d3qut2e2irn15fujvdtpkdkv1/bisupu.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/su7legctp86nd9ru22av0cniem/tigikezotolag.pdfIn PDF document text
    • https://advik.net/userfiles/file/20597950795.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/c8c4416ce0f0d0354cc3c62801208384/31601426762.pdfIn PDF document text
    • http://snsi.jp/image/news_file/zenojafefopunag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=markov+chains+exercisesPDF 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_off0000b260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB260 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA72 16152 bytes
SHA-256: a4045d8d800739d055e6cd14d5bee5182a1a0b2145333c5d0ef62bc0a689493f
font_02_sfnt_off0000f381.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF381 10436 bytes
SHA-256: 70b0861838502cabfc47183b20a76bde8b69fde93608cc673d760d84bdaa0703

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