Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0762ffdcd409ec0…

MALICIOUS

PDF

82.6 KB Created: 2021-09-11 07:38:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1135a06d7d5aed0e69c699b3d44eecb9 SHA-1: 81c5a809878559c51efcb19c36f0df119af6203d SHA-256: a0762ffdcd409ec0e6aa08210ba920ffa9cf436230782f9a6442281e362d7644
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support a phishing or malware distribution attack pattern.

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://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135a96e41008---menuduzinowezel.pdf
    • https://mimpishio1bet.net/contents/files/tofevomonivinibopo.pdf
    • http://aroma-es.red/yamituki-n/uploads/files/57944517347.pdf
    • https://villatoscana-pi.it/userfiles/file/76789300487.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130284d81a9d---88717874317.pdf
    • https://myclubowners.com/userfiles/files/setulofudiza.pdf
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/76678854282.pdf
    • http://ap116.ru/userfiles/file/38679234724.pdf
    • http://sinosteelcode.com/filespath/files/20210911105412.pdf
    • http://studiolorenzoni.eu/userfiles/files/dimomu.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613173c77c111---powalevezifamivawasonog.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/sagutamakij.pdf
    • http://aurora-c.jp/files/files/69888956783.pdf
    • http://studiopetrilli.it/userfiles/files/fakozi.pdf
    • http://statsale.com/data/upload/ck/files/72694609047.pdf
    • http://www.jucadent.es/ckfinder/userfiles/files/wefiwigevedozilejezifabi.pdf
    • http://morebricks.com/ckfinder/userfiles/files/dobimusaruv.pdf
    • http://pro-group.ru/userfiles/files/rekovuw.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/padedenuv.pdf
    • http://saveondealz.com/ckeditor/ckfinder/core/connector/php/uploads/files/razis.pdf
    • http://adice-area.com/pictures/files/97281138455.pdf
    • http://netichikawaya.com/userfiles/file/bomemisulasipid.pdf
    • http://kezheng.net/Upload/file/40251171052.pdf
    • http://pomodorolennep.de/gfx/userfiles/files/34329334680.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=god+of+war+android+download+ppsspp
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd21.bin
2acf96aabe1b6f06ee1cb3237a703709013ca056849d20903b6e885b63c3f3a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD21 18484 bytes
font_01_sfnt_off00010c9e.bin
42a02b1591f55922cb5c38a4a0334ace63109fb530a2c7d0ff99f8c8f18739aa
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9E 10388 bytes
font_02_sfnt_off00012440.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12440 16792 bytes