Malicious PDF — malware analysis report

Static analysis result for SHA-256 b897a2fc55a66b83…

MALICIOUS

PDF

88.5 KB Created: 2021-06-28 06:14:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6be0b3e166e85a34002959219690369c SHA-1: 8f8915ba57c53c85fb761f38c11375ab0e6f2f2c SHA-256: b897a2fc55a66b831023ed447e370df569ea0029fd2d7bf5de4982c551e70081
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress upload directories and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soudurelauziere.com/upload/editor/file/vukufuzonelazinexazo.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/aca41926b09150ad23f1a0cc9c87315e/70858452124.pdf
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/e23334b214f03a4a948052fac4bbe961/nilupivadal.pdf
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160724ace37272---88073192612.pdf
    • http://txextremecarts.com/userfiles/file/24919678535.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f476bbe0---rinebufile.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/vfuukfvn5o6oqe868eovt7194k/24276083927.pdf
    • http://bright-mineral.com/uploadfile/file/2021052916520389.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/4vrrmck6k2g2v49jekcr60khkf/24259111304.pdf
    • https://www.cr-sdc.org/wp-content/plugins/super-forms/uploads/php/files/3d25b55d8e303d4b60857e98156b75d9/14882807398.pdf
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb4ef92594e---90371854596.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/def740fc18359782e6d7a7431deb88d6/gapekiwik.pdf
    • https://zoldlepes.hu/userfiles/file/73105897242.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/70b95f221e801c3977b73c266bbe6433/dotivosobagirebevudavav.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/bivetivuzusixevij.pdf
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/6a03d6ed0308fba0ca1effcef6b86ea5/togibew.pdf
    • http://wsm.hk/images/uploadfiles/file/52084417801.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774155130ea---pawilizegixijabuwogida.pdf
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609abc13e0784---mapudojujekewurakaz.pdf
    • http://lncxjzxxw.com/upload_fck/file/2021-6-23/20210623202940964786.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160781d21171fb---4660747033.pdf
    • http://cityhelps.org/clients/6/61/61afa7a028a8e04f14432b0fece6f2b0/File/wimoboje.pdf
    • http://siembra.me/uploads/files/fevukofogidamu.pdf
    • https://aslimitada.com/userfiles/file/gitumabalodaparago.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=lewis+structure+for+h3po4
    • 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_off0000f4df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF4DF 16792 bytes
font_01_sfnt_off00010cf6.bin
e51c17962c5bb9e6bf60655a7e2c97daa57cf9971fb1bef299ce1d3d4bfcfe9d
pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF6 10656 bytes
font_02_sfnt_off000125b1.bin
09fbf608ed8e9cc2457d8fe8193c7cd61a3d1b90a34cc895629700c5eda2f1b2
pdf-font-stream PDF embedded font (sfnt) at offset 0x125B1 17756 bytes