Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d1b6a25e1c90f1…

MALICIOUS

PDF

87.9 KB Created: 2021-07-16 09:38:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: e2b4c5dfc9ddf7a363b5d5f561470db2 SHA-1: 321a6463837bb0acc01fae2137cc72e69532c845 SHA-256: b0d1b6a25e1c90f107723bced9fafbae6dd1407795f3d5c72b73427141c0eeb1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many pointing to compromised WordPress sites or disposable hosting. This indicates an attempt to lure users to malicious content, likely for phishing or to download further malware. The ClamAV detection and ML classifier strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://empylean.com/wp-content/plugins/super-forms/uploads/php/files/2g3cb7i5rb3bcnu1eqssv8prsk/tefarexumipezarorefava.pdf
    • https://xn--80aaaglcftt5alesfkk7f.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5d4c2ded7f70d26b6b0718b917e54a10/mavijezuxezuwabopesuvut.pdf
    • https://viessmannboilers.ca/fck_upload/file/jilejim.pdf
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/og3hfcjhmgck4hs16vnkm701i2/18988509496.pdf
    • http://fzcce.com/aimgs/uload/files/75785610537.pdf
    • https://majubesar.info/contents//files/1193050698.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dbd2a3383cc---45834521238.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc05ef27f5---50407828050.pdf
    • https://securitydm.rs/slicice/file/47562734756.pdf
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/160875b9fbd862---matumasudaru.pdf
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/c61008745b3360fcc045ab5174593d7f/49465238901.pdf
    • https://i-chat.tw/js/ckfinder/userfiles/files/31225886427.pdf
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/bb89mo54o3ovviesd7vef5slt1/mekugofobamug.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b79446b0ab5---mavewavofesobosave.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae4265ed992---7152303937.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd1cd9a30d---daxopabipelun.pdf
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160710da0ef187---reboketasulejew.pdf
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/r5gbf2tcl3ct4qkt5q93frna6n/77757716822.pdf
    • https://aonetreks.com/uploads/file/2511813870.pdf
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed189cf3f---rumefibitupi.pdf
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa301bd243---molekujavu.pdf
    • https://robinio.de/wp-content/plugins/super-forms/uploads/php/files/vcnhufb1iqcuolbehu05fqu61f/zevexitaxofomoxugatet.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/risofizimusibire.pdf
    • http://ttccid.com/userfiles/file/mudurofamuruxozudiwafote.pdf
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/cbfadc52e3dcfc111e1a5f3cfc672946/juzikugiboluzukimafavaje.pdf
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160817b431fdaa---71684561413.pdf
    • http://bassbasement.org/userfiles/file/51919973966.pdf
    • https://sv-fin.ru/wp-content/plugins/super-forms/uploads/php/files/6ee933469335544bce5faf32ce9eebc3/mugawaxasuvon.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+get+wand+in+minecraft+ps4
    • 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_off0000f27d.bin
4d46036a6531685ef1e2ffcf2a6c38e92a6bbb25384fbd3154d1d093a16129de
pdf-font-stream PDF embedded font (sfnt) at offset 0xF27D 11072 bytes
font_01_sfnt_off00010c21.bin
7babb8e6c1fbb5a351f90b5bdf0899c158b137b3c137080a43cde4281da6d594
pdf-font-stream PDF embedded font (sfnt) at offset 0x10C21 17568 bytes
font_02_sfnt_off00013a00.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13A00 16792 bytes