Malicious PDF — malware analysis report

Static analysis result for SHA-256 79d8054f99830458…

MALICIOUS

PDF

94.9 KB Created: 2021-09-20 02:23:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d92247bfd7e264c2b994f3a5e4b8b293 SHA-1: 6bf55edc855b7c983dfc21a48f6fe1d4740f95fc SHA-256: 79d8054f99830458ded98a5152208be8dc011afc116a8a4c3c270d3b9afdeaa2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of embedded URLs and the PDF structure itself are indicative of a phishing or malware distribution lure, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=diamond+generator+ml+apk+download PDF link annotation
    • https://toscanafantastica.com/userfiles/file/14099807926.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/6405913539.pdfIn PDF document text
    • https://epponline.com/mentorfinancial/page_images/file/44631267220.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/zezogo.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/fivomulamudewedibofom.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/16732847220.pdfIn PDF document text
    • https://solturism.ro/images/file/13627340893.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/42033241108.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/magazogudotalixezeworope.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/nisejufa.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/30254841125.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/14694139311.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/56483165117.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16137de1c6f20e---kogesamoxumopagugef.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/161439ef7a3dce---72323842841.pdfIn PDF document text
    • http://euredit-editions.com/userfiles/file/boxokuzevoxekumavudipizev.pdfIn PDF document text
    • http://qualityfirstservices.pro/testingsites/advantage_aviation/assets/media/file/56947472058.pdfIn PDF document text
    • http://pk.mo/userfiles/file/87348828303.pdfIn PDF document text
    • http://xinxinhouseware.com/uploadfile/files/37877533120.pdfIn PDF document text
    • http://pokwuttibut.com/file_media/file_image/file/nepujozadifi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b7fa26256d---56147690791.pdfIn PDF document text
    • http://mp-hd.de/data/aktualnosci_imgs/file/45496683131.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/webofigeziviparokew.pdfIn PDF document text
    • https://iohrp.org/f_files/files/bomuzuvemugobeveju.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/15959658537.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D67 18636 bytes
SHA-256: 7cf4125793cfaef27cffe25fece329783b3d7aad8766868ea50e681c1ee51ca4
font_01_sfnt_off00013d2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D2C 10744 bytes
SHA-256: 14e2b01bd524d5641cbe35f70cf035bb975dfa09663ae8c09ca6a6704a8ce320
font_02_sfnt_off000155a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1