Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44a678601b1a359…

MALICIOUS

PDF

81.9 KB Created: 2021-09-01 16:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d75fb0d30b0d69f384d2cc76b87817d8 SHA-1: daa09aa88bf165fa7c9e378b7d357f9d9d3225e7 SHA-256: f44a678601b1a3590e79790dfade90ec5597a4b425d7c0e75f46ac645bd63a37
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. ClamAV and an ML classifier also flagged this PDF as malicious, specifically as a phishing trojan. The presence of multiple external URIs and link farms suggests an attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://genbreedpublisher.com/files/upfiles/file/jasetibexexegolu.pdf In PDF document text
    • https://pragatitic.org/ckfinder/userfiles/files/61327360347.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/786ad184e37a5f4bcd6b69673330c35c/buzezagabupusawa.pdfIn PDF document text
    • http://lungtransplantopen.com/clients/d/de/de7cc03d42bda6b8b84c8ac9728529bb/File/72258491782.pdfIn PDF document text
    • http://polaryachts.com/res/wysiwyg/file/16486524350.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16084a0bce7757---39584996762.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1dcafa4c1d---zituzesawudadezawi.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/53510969831.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/wubumowoduf.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/25860506235.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sujivezirekuz.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/413e89db1051f46a29242c1f5e74ff4c/boritanaxefarive.pdfIn PDF document text
    • https://xn--80aaa1anac6cg.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1b7b6d1715e5f85021a426c67357bc6d/94618271710.pdfIn PDF document text
    • http://www.libroparlatolions.it/backoffice/ckfinder/userfiles/files/90614820494.pdfIn PDF document text
    • https://visaonline-vn.com/wp-content/plugins/super-forms/uploads/php/files/904slf1ubkj0cfkq54qnbje1gi/gomol.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210808015910.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/46022016006.pdfIn PDF document text
    • https://rajaunited.com/contents//files/silapotuwufapepuvuzag.pdfIn PDF document text
    • http://adirondackseafood.com/ckfinder/userfiles/files/57883055480.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/84127836021.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/jojebilerimuzotez.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/2abc412a046f9ecd9c0d96cf1643bc98/32654347028.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=a4+paper+size+height+and+widthPDF 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_off0000d8db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DB 18928 bytes
SHA-256: 9fe22cc89264f2d8217065a0464f30247053bcdc0335a672d3937caabf180de5
font_01_sfnt_off000109c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DC 10708 bytes
SHA-256: d7810a315d5b3f7b258f7e3735a915efeb27b1bad1117d0592d9cde5a168aab9

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