Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a0e1b353cc4bf0d…

MALICIOUS

PDF

70.1 KB Created: 2021-06-18 01:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ebc6168e51b9b94f6253653d7971ca3 SHA-1: 605c0221ece2a21e7a0bbd8448a842178fecd0e9 SHA-256: 1a0e1b353cc4bf0d0465d5116a6d829759dac1b50e5067933d94476577ea4aaf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The embedded URLs, such as http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0638d352---81731545241.pdf, are likely used to host further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0638d352---81731545241.pdf
    • http://voxel-avocats.fr/uploads/file/kedilafaweparujameserogo.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/160821a811b878---fuxaxa.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/86cf5af527713a2e26336e2f92559174/sedimivit.pdf
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/90ec370903a069787bff4381c623793c/69175617830.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/8b0dc9eb4d5d571b18764341352e4089/tojijimena.pdf
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077941044085---54762249139.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/adkot4u1s7hso1favdu67tin36/rirenani.pdf
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/1cdp2dj4eruhgfornmk1s3tiu1/91918884983.pdf
    • http://apisicul.com/userfiles/files/buloripelewimu.pdf
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/98dd9a162c4683d3b1dccc031c5e7f6a/tagegika.pdf
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a89a618a331---dirivepugigexesupuwopebel.pdf
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096886108433---kiranen.pdf
    • http://granite1962.com/clients/869125/File/4711587607.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/inno8m8s7ao00d8n4i2ql1bu50/mivegezupan.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=java+coding+interview+questions+for+qa
    • 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bba5.bin
c990289b3e757dd55b663c5c3f88e4809b156113dfe1c239f270e5d7f59283ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBA5 5304 bytes
font_01_sfnt_off0000cdba.bin
7f38c7bd3076d5ec567b373f8788658f617417f44aeaffad1c2d563936ecbb0a
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBA 2268 bytes
font_02_sfnt_off0000d7ca.bin
dada962b06279585aa60faeff91e3c5bd82eb6c9f0f9872c0b6edcf32b16989a
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CA 10956 bytes
font_03_sfnt_off0000fd0e.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0E 4324 bytes