Malicious PDF — malware analysis report

Static analysis result for SHA-256 b256fbbfa3569115…

MALICIOUS

PDF

86.0 KB Created: 2021-07-04 02:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6ea3abde2bc01ba62f8fc7055f6ac94 SHA-1: 8fa28bbd3e172b11dedd52a4be933d585b355e18 SHA-256: b256fbbfa356911566da0645e0e611e53c34a2cb600830e8e84d8a3ae9436ec4
156 Risk Score

Malware Insights

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

The PDF file contains a large number of links, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, so the primary attack vector is the malicious links embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://alakharia.com/public_html/userfiles/file/21272263321.pdf
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/56a581680154771494d5434b3234815e/40061105413.pdf
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/e3a9dee06de595dc717295b556db0767/xonupifemugapu.pdf
    • http://asfus.net/virgsurv/userfiles/file/luzoturiliraxosokizul.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/99758720297.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae2847ad532---47923361180.pdf
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/cauc3orb6hgjqbu4bho6prhkfr/79418146616.pdf
    • https://noihoithanhtuan.com/media/ftp/file/56418568212.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9b9028e0ec24281f1230d8a656f5b3a0/jowiminunewexerul.pdf
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/7db45f8ecd89ccc0810a6fb9eebcdf29/37264303173.pdf
    • http://apcmagon.com/userfiles/52318091537.pdf
    • http://thermcom.cz/userfiles/file/gumefumedaxiz.pdf
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607362d662992---42534986465.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/979ea5385aee3a6d36b8a7e5333c26dd/tobakaw.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1608516e5468ea---wigulukakawi.pdf
    • http://studiogaleazzo.eu/userfiles/files/xubuxirolijajiju.pdf
    • http://geometrarontani.it/userfiles/files/40850818535.pdf
    • https://aawyx.com/sites/default/imageuser/file/belanejolot.pdf
    • http://cortabellanews.com/userimages/vepurumasofikaxetofizude.pdf
    • http://neonatal-surgery.ru/userfiles/files/30885224413.pdf
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160783190529e3---92234362534.pdf
    • http://clairerolo.com/userfiles/file/nilaweva.pdf
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f702bc517f---20310066163.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=beeswax+in+sweets
    • 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_off0000ee79.bin
9c51fa376ead7a69c3b775cc20312c233e0e6e8e0a924591304c1a243495c550
pdf-font-stream PDF embedded font (sfnt) at offset 0xEE79 17596 bytes
font_01_sfnt_off00011c79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C79 16792 bytes
font_02_sfnt_off00013490.bin
f40057e0e54c94ab0d6c3400f5a5a99cb63da35fc3b328496c1d686ef1b7c6eb
pdf-font-stream PDF embedded font (sfnt) at offset 0x13490 10076 bytes