Malicious PDF — malware analysis report

Static analysis result for SHA-256 39875a41474abdd4…

MALICIOUS

PDF

92.5 KB Created: 2021-07-14 00:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: f09085e95d5478e9f999c1f26ddd2d40 SHA-1: 737c0f44548839357f01b8cd4f58681b7fbee471 SHA-256: 39875a41474abdd4d59a6efe002b7f99a0801d2d0c5e14c3ea2aa47c64e10279
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the PDF is used to drive traffic to potentially malicious or compromised sites. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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://catamma.ru/uplcv?utm_term=practical+programming+for+strength+training+3rd+edition+pdf+download PDF link annotation
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/q7tn6u7km1gkirklrvh2mk3s90/17259686057.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160dca2b9dbb8b---34032548164.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ade013bc1---93142950716.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/03646e1f8b6bd6ad70773c8cff06524d/taragoxosu.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609f5ff721773---62251443398.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/10aa60a333263be8151d85cbcaa1ce00/76873615981.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/kegeluxalejamo.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfe5f2cb69---337185703.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda22e3d8c---latakakaranip.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160927c88769fa---94053878088.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad4099cfe6a---98814957121.pdfIn PDF document text
    • http://formel1vermietung.de/userfiles/file/10994591087.pdfIn PDF document text
    • https://samsungklimalar.com/upload/ckfinder/files/56095239282.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609083537de56---52525942269.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/b5a38e6a278d77ec26a0551870194245/rujorawe.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607aba6daf3dc---gamovomewazepapagamamoju.pdfIn PDF document text
    • http://maihome.hu/admin1/file/tukugoxoxuladugobanitetit.pdfIn PDF document text
    • https://abeess.com/userfiles/file/12396399163.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/14761649707.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/70127f57f2d688b92ff8f50ef398d585/rafimejivol.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9af314316---viwujajovujonenozumomata.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb6cd97772f---gawegapelojasumat.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_off0000ecb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB2 17204 bytes
SHA-256: 3bbd84a8a52e68c521cd2cb37b346f0cde0dbdaaf8875b93ac752cd951c95d66
font_01_sfnt_off00011993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11993 16144 bytes
SHA-256: fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
font_02_sfnt_off00012f12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14729 11324 bytes
SHA-256: 32e4d29acc209ccd8ceeee6b85fdd02f210649746b1540d7b102948848f0abcb

Open this report in the interactive analyzer, or submit your own file for analysis.