Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bcd765a7acc4a1e…

MALICIOUS

PDF

72.7 KB Created: 2021-06-25 12:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9b7ce790a03e9d8684278bdce88cf43f SHA-1: 73b8ae83c9ae37c2241dbc3314dcc8d9cdbd189d SHA-256: 4bcd765a7acc4a1e25ec34cc197777c27a36becf1adfc620dede9d1793beec28
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable hosting. The primary attack pattern involves directing users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=boys+over+flowers+sinhala+episode+22
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160784e817d0f8---98430706477.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c368927110---rujowuzazotapidetopeb.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b879680a3---reregejelu.pdf
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/ab2898733855b64f38f903fe746b06db/40208083672.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f39ce177e6---72436126084.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081997512a69---5813292157.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/hg384t43gprov8i6mdra70jc76/6256653308.pdf
    • https://clubforeducation.com/FCKeditor/userfiles/file/panetabuxosupekobele.pdf
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/b50ca5fea0745c55546caddc63f40ffb/lifujaxugibuzetejovupimak.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8b01e90b6---14018296192.pdf
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/tp291obsniqpg22qvcs3telhtc/83891799171.pdf
    • http://aiswaryamatrimonials.com/fck_uploads/file/41105830198.pdf
    • https://www.chesapeake-lighting.com/wp-content/plugins/super-forms/uploads/php/files/274aaf03ce7300b0ca9dfa4c12342153/notetudeberasejisoxige.pdf
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ajnp9shteuct2elbvll7fdqqa5/wexovudademefi.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa6b0cd99d---javujerasexovulofap.pdf
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/a0dc09445921dadeacd072e095418597/64477879790.pdf
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/16dbc2bad02fe2c3e4c26356a787b416/tapuraxefi.pdf
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800ba64fbf8---11305364645.pdf
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b1ca.bin
e9936748adbdc90cb0b68664bc7a8514b2654d3fba9bc5583a0028f9ae1b885b
pdf-font-stream PDF embedded font (sfnt) at offset 0xB1CA 2288 bytes
font_01_sfnt_off0000bbd2.bin
07972a3ad49a0cb918eef47dff67c131350f7a823031a8bf67c355fd5aed9b7b
pdf-font-stream PDF embedded font (sfnt) at offset 0xBBD2 10936 bytes
font_02_sfnt_off0000d533.bin
c9592c9892f171bf83165a885adb5b75be74f8cd0c05ac3e06a23de35abcddd3
pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 15652 bytes
font_03_sfnt_off0000fd79.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 16792 bytes