Malicious PDF — malware analysis report

Static analysis result for SHA-256 d528d6a2b8c93ea6…

MALICIOUS

PDF

130.0 KB Created: 2021-07-02 04:48:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e89f9de3ba368be6b3d6c855c61dae6d SHA-1: ba82f38ce2639de50f1a4667ec470b2458ea4f26 SHA-256: d528d6a2b8c93ea68a1bc5b6c569b324ca89bf817b3d3f679cb0f871527a0c52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded URLs, many of which point to compromised websites or are part of link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of external URI heuristics and link farm indicators further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://www.deewanalarab.com/up_imgs/tirutololadi.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609a96995e50f---25689506695.pdf
    • http://alpha-cp.com/userfiles/file/somatevuzujibowogufumi.pdf
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9d2a357d27---20044740872.pdf
    • https://rajaunited.com/contents//files/kapinineweza.pdf
    • http://charivne.info/images/file/duribaromuropatoliteg.pdf
    • http://sgd42.ru/userfiles/file/mejulijili.pdf
    • https://shopabrang.com/images/files/62619484521.pdf
    • http://mamam.by/upload/File/file/68655157574.pdf
    • http://sisparts.pl/zdjecia/fck/file/zenufazej.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/0f0d0e1bf4f77ec2ae0b3e3ea80264bb/70339407458.pdf
    • http://telmeed.com/web/ckfinder/userfiles/files/97272813728.pdf
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfacb61169---51306643206.pdf
    • http://arcenevents.nl/site/upload/files/31239540128.pdf
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072ac274611b---lewenogipijegamizajowota.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/0qvj3scol192gg0tqstdvid7s2/saxoxavavenezurovuluduvi.pdf
    • https://chetanaus.org/bheru/uploadfiles/file/juwovugez.pdf
    • https://protechlighting.com/wp-content/plugins/super-forms/uploads/php/files/0d4fb9740e06b8a05a2d64b05916f0a8/wipiviviro.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/05b0c19b675e56e61c66872e98032a03/26732452281.pdf
    • http://writtenmail.com/upload_images/file/zebinofifexewixufez.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7a3b6de64---30452885818.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/duv44q11t0idcdplgvvck4m1vd/31226267648.pdf
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/40417344860.pdf
    • http://sutphinsgermanshepherds.com/clients/21958/File/96529142541.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=phonetic+transcription+of+chair
    • 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_off0001822e.bin
b2bf64e9ba1ce2be2d28329df22df2272b33122d35c778837641f22b732db097
pdf-font-stream PDF embedded font (sfnt) at offset 0x1822E 10532 bytes
font_01_sfnt_off00019a25.bin
db067c55061f3b4c830ecb70f333ee7c405b68dada20134bddda686a9f0db888
pdf-font-stream PDF embedded font (sfnt) at offset 0x19A25 26952 bytes
font_02_sfnt_off0001e0ad.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E0AD 16792 bytes