Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4aa20bb7e413c6e…

MALICIOUS

PDF

78.9 KB Created: 2021-09-12 15:31:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6b8dd029e77c98ad62d4887a7d7c92bb SHA-1: 2b358463bc59e04e6c9a096e0f0df01f03e1f101 SHA-256: b4aa20bb7e413c6e6d24eb4f6e47b05b02ceaa5bbacfdb93ffee4fd6f090d7ad
176 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many of which point to compromised CMS upload directories, suggesting a link farm designed to redirect users to malicious content. The presence of these links and the overall structure indicate an attempt to lure users to external sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef35301490---sunevesokaribu.pdf In PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/sspnbpj188sp5h78lv71cv3t36/rodimuvajek.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/31238794036.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/11441472139.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cfaf6413d3---97979329143.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/varavikebakoxoxutiwit.pdfIn PDF document text
    • http://myapartment.de/web/editor/files/58361153370.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/tejufavoxumanofenudizun.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///22330617576.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/rurigikewuzadako.pdfIn PDF document text
    • https://trungtammatnamviet.vn/upload/files/33126604154.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/16137d1a92f2aa---80765283168.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/36309042890.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/99127929152.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/22641456109.pdfIn PDF document text
    • http://ammk.sk/userfiles/file/gojelulofirozujagas.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133d84358bd6---nadaj.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/nutopumolitopabiwuratana.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/a7bcab6db8f8d627123b7c43e274ce9f/sofulibijo.pdfIn PDF document text
    • https://lee-trading.tw/archive/upload/files/junabewelifeduta.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161391dad33060---xewemef.pdfIn PDF document text
    • http://cermak-expo.cz/data/files/file/tezuvutedujofukuje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=how+to+get+robux+from+peoplePDF 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_off0000d141.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD141 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE953 17868 bytes
SHA-256: 2e0646d487a06c26831bcec40cb79cd97478bff4159dc6e4a3e2ba4fa1cdd8bc
font_02_sfnt_off0001169d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169D 10596 bytes
SHA-256: 8e08c29aa49e546e5b5e8306d88acbd6a7c2de082f61d971983326584ec2330e

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