Malicious PDF — malware analysis report

Static analysis result for SHA-256 abec36244986ef45…

MALICIOUS

PDF

86.5 KB Created: 2021-09-22 09:50:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ab257d56d3d27a63c7b79692cad8215f SHA-1: 28f3cce27ac503e664daaafc98d6231b528ba8b4 SHA-256: abec36244986ef45ba64fa2cc8df76dbe28b89fc4c52d31b12b0981f2acec92d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing or malware distribution vector.

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 http://frangarcia.eu/upload/file/bokabajiso.pdf In PDF document text
    • https://whereestar.com/marinarubicon/admin/file/xalozunafebelutokavo.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/fomodiwipudakose.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149bbc0c4d55---76926181758.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/78229062316.pdfIn PDF document text
    • https://charming-dc.com/uploads/files/202109121723359914.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/kokuwo.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/regig.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/7669492109.pdfIn PDF document text
    • http://ros-grad.ru/fck_editor_files/files/77112276917.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/45293229088.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4f15f012b---25031367149.pdfIn PDF document text
    • https://aqualibramontois.be/fckdownload/file/56358975222.pdfIn PDF document text
    • http://babywagen24.de/userfiles/file/tefojekijigazusivu.pdfIn PDF document text
    • https://laps.pl/userfiles/file/68527175145.pdfIn PDF document text
    • http://sxsasa.org/images_fck/file/1630837403.pdfIn PDF document text
    • https://www.gico.ge/ckfinder/userfiles/files/zodokonutupemuvajewa.pdfIn PDF document text
    • https://szelvedojavitasmiskolc.hu/files/files/11607857175.pdfIn PDF document text
    • http://scarpatti.com/files/76484514828.pdfIn PDF document text
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/6b356c22acdb1a5b1f06191eff6a0653/peboseparibujemapo.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/vexerifaxukagokigerifino.pdfIn PDF document text
    • https://lanjutpt1.com/contents/files/23087931254.pdfIn PDF document text
    • https://bursaphotofest.org/uploads/files/53378438321.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/1441193a7dae1d2d184e93323bcd4523/bunivajekukifo.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/0asa0gmopk77elldt3nb7ip7ke/12646036772.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=cities+skylines+maps+vanillaPDF 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_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 17080 bytes
SHA-256: d59786594e323ee30dbbc7fea3223afab931bba68265e1201ca4931fe89a054c
font_01_sfnt_off00011c21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C21 10496 bytes
SHA-256: fa8c0f5473594b8c5d23bf523a2519e80ddc79f102fe3a0fe33a949a0d8f7983
font_02_sfnt_off00013409.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13409 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1