Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bc422ba5babf3b…

MALICIOUS

PDF

89.8 KB Created: 2021-06-27 01:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6741aafc31a65bb82f063c95fd7f9e6 SHA-1: 31c94ad1fef6926e6a4ec3818a9d5d3bfc7cca0a SHA-256: 20bc422ba5babf3bf0b3bfd12a2f27afecaa7be090e2fe7b665387612798fcc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, with the PDF being identified as a phishing trojan. Although no scripts were directly extracted, the structure and URL patterns are consistent with phishing campaigns that leverage compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/0e4abb65ee3ef5ae5790efa64c899ccb/16741080783.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb24f8c175---kegalefexajoxiwofi.pdf
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/1db40952c5475b58a53ba19f24396bdb/xinumavafazapowudapas.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bfa4de2d9---tisufugebe.pdf
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/97fdcee750097a5fe88e8ebbee55c345/77512151334.pdf
    • http://arohitourandtravels.com/userfiles/file/38555343630.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/a4f9da53b5c051239408aa28d65a9a55/96900879127.pdf
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c42150a4936---92600012294.pdf
    • http://bogelaipigeon.com/upload/file/vataluw.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/3d8a6f8c1322631a0684ce9bf2e431a8/36677253976.pdf
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160722e625a3da---80138492734.pdf
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2bbed83330---pokerevo.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f6176b04a---lalimanafejij.pdf
    • http://solac.nl/app/webroot/files/userfiles/files/70685237504.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c81649391cbaa8ed9a7c8ff41ae3c2f4/16111925965.pdf
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/349a53a62c86c2fbbbb00d1d769b32e0/kitudobujaropimajujex.pdf
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/b5eae40de7a4cf17abbe07a9147c2ad7/63106463719.pdf
    • http://ahcxdq.com/uploads/file/151054487275.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c67aee0dfb---43875611979.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/df15d0ea6d1d2cc6c051b32a1cb81b96/xawobokimikixoxoli.pdf
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/t5ni8lgepcnnohkfnrk7b08ur6/6786855437.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ada8cd79195---99520819433.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a63b80d86e1---34061362538.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+draw+a+sketch+of+a+person
    • 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_off0000fbdc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16792 bytes
font_01_sfnt_off000113f3.bin
75cc09c4b373d487eadb33a8435b80680a80081333611bd68dd3a114b7cc883e
pdf-font-stream PDF embedded font (sfnt) at offset 0x113F3 10748 bytes
font_02_sfnt_off00012ca2.bin
f43a776779bb83fba2677fe9a35fb61349f66b690eac8da27aaed9d0a8381eaf
pdf-font-stream PDF embedded font (sfnt) at offset 0x12CA2 17392 bytes