Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b1be556c406e558…

MALICIOUS

PDF

84.7 KB Created: 2021-10-14 08:03:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c813e2300266433f54d4dd9c58347307 SHA-1: 2966a064ddd7919c84eeb44cf2c94bdb1bffeb1a SHA-256: 9b1be556c406e558f72fd16a4bac5cc101cd1b65a6c681a3bee6b819b3e1f175
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://krisoc.ru/uplcv?utm_term=cyclical+change+meaning PDF link annotation
    • https://valaszut.jobbadni.hu/userfiles/file/wudoxupaw.pdfIn PDF document text
    • http://myconnect-thailand.com/image/upload/File/28027847111.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/7c228cf967280975fdb96f41ffa5ac69/43768800440.pdfIn PDF document text
    • http://klm-co.ru/foto/ck/files/leforugivu.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/fuwolazapolebuzupek.pdfIn PDF document text
    • https://intersensor.ro/v2011/Files/fck_upload/file/zevetutebuxolosirivugizoj.pdfIn PDF document text
    • http://gemwishrs.com/ckfinder/stones/files/zudofejufumofifor.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/bonigofikibuk.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/jizojuzivazosifama.pdfIn PDF document text
    • http://oikoscoccatoarchitettura.com/userfiles/files/16868972477.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/voterizamuzibedol.pdfIn PDF document text
    • http://controlsystemco.com/cache/fck_files/file/mojeputoravowowefegokaza.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/sifosidagekisobewuso.pdfIn PDF document text
    • https://yunglin.com/uploadpic/files/72632225199.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16151a24f5dacd---37730419622.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202109090500281154.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba0be2973e---retijifum.pdfIn PDF document text
    • https://performanshost.com/calisma2/files/uploads/67926337366.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/zaxesetuzabagoraz.pdfIn PDF document text
    • http://www.kymenhome-etsinta.net/tiedostot/files/2988815579.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/e192cb6a39136c7e47c44c6d45095579/82789497782.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/41751528178.pdfIn PDF document text
    • http://yhbinternational.com/userfiles/file/bipitalamukozituloxukolu.pdfIn PDF document text
    • http://maxbrio.kr/files/files/2108664438.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/26013158090.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_off0000e0ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0CE 19612 bytes
SHA-256: 91fee98854cb3ee7f5118a9c6d40113b86d86bf91410e0be75b8def44600ee6c
font_01_sfnt_off00011449.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11449 10336 bytes
SHA-256: 25dbc3922604614cabea6749fad0d6efdcc1b3fe83e060b4af4281e039c57777
font_02_sfnt_off00012b61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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