Malicious PDF — malware analysis report

Static analysis result for SHA-256 a93ee7007a25c216…

MALICIOUS

PDF

85.5 KB Created: 2021-09-05 10:21:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8101528db82c775128d233aa7c23d5a6 SHA-1: 8375df99b5cb0ba31683ff8782c93c403cbb5b9b SHA-256: a93ee7007a25c216221d0f35113f3ac84bd401838234e708f63530a769b881ce
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan. Heuristics indicate it contains a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting a phishing or malware distribution lure. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://peoplehelppeople.net/uploads/File/pibedipowitetawejigovumej.pdf In PDF document text
    • http://islandpointfl.com/userimages/kutupenagesitupitewe.pdfIn PDF document text
    • http://mousike.it/img_ins/files/98978439006.pdfIn PDF document text
    • https://thinkhigh-tech.com/d/files/zojolufowitojir.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/ukg2pil317h2jgj6ue05g01d63/nudijofepi.pdfIn PDF document text
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/84f9057e9544e310ce0e5758ccaa07d8/dabudanijonem.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/0ad85f547092104a5e98df65131e19cc/27605994272.pdfIn PDF document text
    • http://dental-forum.ru/userfiles/file/xawujotagikezamug.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/45710802980.pdfIn PDF document text
    • https://budapestpainter.hu/ckfinder/userfiles/files/doxono.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1607cab33a5471---89946717652.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/50799956996.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/wutawukajemalugusok.pdfIn PDF document text
    • http://anindecor.pl/files/file/29481390310.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/6d39a4f79bf46bc4ee6f9a465a6f5764/21818940566.pdfIn PDF document text
    • http://ozgu-yapi.com/firma/files/doxukikagidofalojix.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074b9862e62b---xananar.pdfIn PDF document text
    • https://mauspro.net/upload/files/47933506244.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fe53a8623---52995689673.pdfIn PDF document text
    • https://nic-irq.com/userfiles/files/8582079580.pdfIn PDF document text
    • https://kiaavcilar.com/upload/ckfinder/files/sajajusimozudenivijunaxep.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/ropigafivafofaxekeja.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/soxirusapexewusosedoposom.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c696234d94f---jozavuvafima.pdfIn PDF document text
    • http://hifitness.hu/userfiles/file/62748533700.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=taski+procarpet+45+user+manualPDF 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_off0000e841.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE841 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010053.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10053 17992 bytes
SHA-256: 551138d805e5da536f6d03b046216a7a079e46c85e5de608031ce0143a7a117d
font_02_sfnt_off00012f53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F53 10900 bytes
SHA-256: 95bd82dae2bb7378802081c6d2314a49d07962ac26beab095900e6c9be30eac1