Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef65726793a19c3b…

MALICIOUS

PDF

84.8 KB Created: 2021-07-20 02:17:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 03b7215eb8862f29c0f4ad0097a5d8db SHA-1: 82bdc183f213ad39767c51cc826da0b1c401fb7e SHA-256: ef65726793a19c3b5151603b6699e3321117ad22e820663f38e81f1a0921be60
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites. The presence of numerous unknown URLs, many hosted on compromised CMS upload directories, strongly suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4c43202f8---nenosafuratizaf.pdf
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/q4uvqcj87ngj9bigftb30be7aj/kapagexotekadatak.pdf
    • http://www.lebedosapartotel.com/data/yukle/files/xogabapijalas.pdf
    • http://dakmoto.cz/obrazky/file/60304362229.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c790a0b593---xiwijofes.pdf
    • https://blnk.eu/userfiles/files/82497010644.pdf
    • http://bayzones.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/28977883974.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6c01237014---87973589782.pdf
    • https://grup-insaat.com/userfiles/file/nunokowitopejamofivafifi.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6469ef056c---vikunejodivavibebokav.pdf
    • https://ketgate.eu/wp-content/plugins/super-forms/uploads/php/files/bfeaa115c656576dd971d03492c1a6f6/81406409174.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/j334rhbfgs6osk4gjleimf16b8/87356204147.pdf
    • http://shesob.com/file/files/18930163554.pdf
    • https://hansenlight.com/UploadFile/files/10095530844.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc5ab19c18---bedewuvenugakat.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608d34a963085---jitasulawifexef.pdf
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/604dfb01519543a5d2ee939b2d106d63/8135367164.pdf
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607fce8584c21---wuxutosaxivemomelilazaki.pdf
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/chrka8b4i42n83t0p3mnp5ifj3/72940926822.pdf
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/ed86b4ce883857594fa39ef705edc477/fetipuv.pdf
    • http://sintellect.ru/Repository/file/lunepiwuwa.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/1taa1ciid63um4gld1amfmjatm/ledas.pdf
    • http://balcimimarlik.com/resimler/files/98015077257.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=my+family+traditions+worksheet
    • 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_off0000e80e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE80E 16792 bytes
font_01_sfnt_off00010025.bin
e59e2eae4a1d7b7ffc485b6d93c8e94d6a3f0d31a676257d0b2258115a951ba8
pdf-font-stream PDF embedded font (sfnt) at offset 0x10025 10904 bytes
font_02_sfnt_off00011939.bin
b0c382acb161cf6fd9e33c09bcfe18cc4295016755fbc889c211f477cd2e665c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11939 17372 bytes