Malicious PDF — malware analysis report

Static analysis result for SHA-256 aafc9ab728d6dd56…

MALICIOUS

PDF

133.3 KB Created: 2021-05-06 22:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8fa878015d6488800be0572403fb614 SHA-1: ed5d585ff7b9fcd3381c8589d7fa9fb333be3c1a SHA-256: aafc9ab728d6dd56ad3720c599105552744b78ff601a5f2079209ddbfcc92b98
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or malware distribution campaign. The document body is heavily obfuscated and appears to be a lure related to 'Chandrayaan 2 launch information'. No scripts were extracted, but the presence of numerous links to compromised CMS uploads indicates a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5b9c3840a---rezavosinubaxavoguvis.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/nh7jd35040eijg98v778omrui4/tonoturatibiduve.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609084da273d2---64686805355.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ff3b0bb156---66558793533.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/e3e1666ad0d6a1ee89201ee7ea4797a6/6109474955.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5feb1eb93---buxez.pdf
    • http://bpabv.nl/uploadfiles/file/wivititirewibesu.pdf
    • https://baileyelectrical.services/wp-content/plugins/super-forms/uploads/php/files/p61u174jen1334ok3m02otvmho/38455098019.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/bdbd10d76b69cc3abec16cefdf167e71/muvipen.pdf
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/tjstif9ds1ks80gmfi2h2f60r1/mumixoputusabomanurezurap.pdf
    • https://www.apollopowersystems.com/wp-content/plugins/super-forms/uploads/php/files/63c4d320c80dffa45cfbcd4653d8845f/98372824798.pdf
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16078586834268---86870659413.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16076cd64e83e1---toferebinilerupilubawepim.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/cbf29f1b7c8f726c9e427b7f84943a0d/xomuf.pdf
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/056809344ed54da425f7811f29e8a63d/duvideduxisimiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=chandrayaan+2+launch+information+in+english
    • 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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001a541.bin
7299d973d8cd787a763e536842b062a487230fc89375ca3ced56cc464f023a71
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A541 5572 bytes
font_01_sfnt_off0001b818.bin
b9b20f9f1b7da781a1c1c103719368e39a11ebfc713557ddcd745a80156f421e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1B818 13816 bytes
font_02_sfnt_off0001e4cf.bin
ead7fd593d7f5feef6f283420e9b55f8fa4552f107c64b0063d474dd3355abd8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1E4CF 16164 bytes
font_03_sfnt_off0001fa24.bin
942721f49c17e3397c5552a4f96cf2239194be14c5c2c2c5a4e20a5f8213e65f
pdf-font-stream PDF embedded font (sfnt) at offset 0x1FA24 3236 bytes