Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a27061626390f09…

MALICIOUS

PDF

89.7 KB Created: 2021-07-02 05:58:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76d722899565f24687e0791c7dbc7c93 SHA-1: 9420132ac90485db80014b39a27e183b4a1749c4 SHA-256: 7a27061626390f094118fa9af64fbab3e8ef9d67a82108c336d9fe4c075b4aeb
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to compromised CMS upload directories, indicating a link farm designed to distribute malicious content or phish users. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9746

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 http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/07f1530f2267af4bb5137a60a3f82094/kivodago.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab446c1a3c3---15849169206.pdf
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077ebe522fb3---73012655306.pdf
    • http://anhuifan.com/upload_fck/file/2021-6-1/20210601141141590342.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2114112bbbf6e43a81285f9b51c79ad6/sivikurazo.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1d431db06---rutesafazebevozofupuvo.pdf
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/9871ec7daed4915d5ae8812f3e19c6ee/67495556256.pdf
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a443660da69---27990326367.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b520c715a9---45826898820.pdf
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/75d02f02012baef78c36360d5bf53b90/75414668566.pdf
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f52be418b6---lazisuvenuki.pdf
    • http://snnet.kr/board_pds/fckeditor/2021/06/file/xevedekofukog.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/60449090181.pdf
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/vmc8ra3vpgfm6s58eepiu0sim1/viderunilinogadufuba.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b15e4f1e0cc---votawevufuwirizon.pdf
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/pco3e7dgn4e4eb3ph33dn97jq7/28340661341.pdf
    • https://tavio.ru/files/file/82918991434.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/f3ed42f75353f11ba65f5ad1426aea46/37098778318.pdf
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741172d1dd3---19319409113.pdf
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/62058525176aeb6ac7ff3ec37de524c3/44548884912.pdf
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/f0bfda80abbb63ae49979d3a62cbe340/49158735179.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2f22bc767d55bb0af921fe0978284635/44237612473.pdf
    • http://donahoelawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tesefuvalitikamowamobud.pdf
    • http://solamsys.com/userData/board/file/41417839680.pdf
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/bc6107c2a6fa3ff6a86cabf23f87093f/vebetapezemesefaxe.pdf
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/677ee01f7f11989e04ca7fec029f5d12/vumepaserekaduma.pdf
    • https://jamurgoreng.net/contents//files/vifigizafexoxitaji.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+apply+printable+vinyl+to+a+tumbler
    • 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_off0000e6c7.bin
2778035613bdb3a39c77d1b5c5f4139121f173ae237ee327a3b8b558e5fb8c28
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C7 16832 bytes
font_01_sfnt_off00011271.bin
fcca37035df06e555c2991ff65faa0e8497ca6423bee408ebc46b3aef925b516
pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 16144 bytes
font_02_sfnt_off000127f0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127F0 16792 bytes
font_03_sfnt_off00014007.bin
9b27a61d9266e31b32ecc6a97f30bc13337c2710773d8726562f47f3f96b61b3
pdf-font-stream PDF embedded font (sfnt) at offset 0x14007 10744 bytes