Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8a9c0e817b0b2a7…

MALICIOUS

PDF

79.7 KB Created: 2021-07-03 20:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a1a2c9f68eb2553b090c5dfaf9369437 SHA-1: a5a42d3bc9218d22a811f7baa2e8971c7886f695 SHA-256: e8a9c0e817b0b2a7e651b823eb37e6898598b535f947dfe76f8634e4e63b659c
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised WordPress upload directories, suggesting an attempt to lure users to malicious content. The presence of multiple links on disposable or compromised hosting reinforces the phishing and malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607826a555638---lugeke.pdf In PDF document text
    • http://hacoauto.vn/upload/files/85623292676.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ad9b56031b5---nowilezizoserajanixexove.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/kefokuxaxarotokoba.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/8b1a6e4e237d86216bfe366522242a99/35762925395.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/75477005593.pdfIn PDF document text
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b38669e8bf---gusepugepededut.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/44498a696ea1dd90ebccc06dff54e342/71789270729.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/cf7ucptbvntk5svg13c2lel481/sobirovijiteta.pdfIn PDF document text
    • http://gtlmarinefuel.com/userfiles/file/bujoputawenuzoselemuku.pdfIn PDF document text
    • http://pcmcpropertyblog.com/wp-content/plugins/super-forms/uploads/php/files/248c31e2b9abae4a134b428b3c9d9b8a/54398841599.pdfIn PDF document text
    • http://skogsformedling.se/bilder_umeny/File/35039120703.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/dd8c945c2d610298f668681c0096795e/miduzesapad.pdfIn PDF document text
    • http://fotossc.pl/_files/file/zuwuzuganirelol.pdfIn PDF document text
    • https://gdr.co.il/wp-content/plugins/super-forms/uploads/php/files/2dd783fec5c3c54bede7adfa3d56a73f/7124279168.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/6006143f3421e1aaef899ff9753c7bf3/56884941866.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/59d583d076d5c8b05ea69557ead7c484/97590271713.pdfIn PDF document text
    • http://drwatsonsr.com/clients/2/2b/2b9a0cf27321ceab3a47fbd10bf94d34/File/panujifunedolug.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9db79a6b5f---20800686567.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/1urru1aipfupl7329tr7r5tqoe/jijalelifevivowenoleriked.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077f07080152---28844733443.pdfIn PDF document text
    • http://apartmaji-zunicmile.com/uporabnik/file/xabiwugilezulogikiz.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e81839117a---bixetososipim.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/plffkmkd3rrohapv1n8cuufmgq/birenarezasi.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/58939327483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=hand+in+hand+withPDF 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_off0000d72b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72B 17152 bytes
SHA-256: bc6b98b7e1a8222aa87db88fecac530156b5a98c8bcc8fe01ed26d80f4b68d7f
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011c33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C33 9856 bytes
SHA-256: b64a9a65e4f3f4c088fa50866ed6777b96844e8df650e87a3ba6edcd144978e4