Malicious PDF — malware analysis report

Static analysis result for SHA-256 2510d8f6a745abd8…

MALICIOUS

PDF

82.4 KB Created: 2021-07-20 09:44:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: de955dc4fb6e9b88201dc803280a7554 SHA-1: 5a688b2ceaf58c8985f4142fe9301ef389159725 SHA-256: 2510d8f6a745abd8f2afcd515eeae0bf190222fe683e3738bb5aa24395aa3c42
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure points to a link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9921

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://granite1962.com/clients/869125/File/58645256112.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a7cce3ca2b3---16055853961.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a265ce812b---47696292906.pdf
    • http://st03.it/userfiles/files/xemowodu.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8925e6ec7---80042627139.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2bd8e8879c---92073485503.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/6s5tmiti9r5jrv75kn3gnmbclp/xategale.pdf
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/160c85a61e72a5---kosimi.pdf
    • http://libertyquad72.fr/userfiles/file/zawimaturibafuxigaxeri.pdf
    • http://ajivikafinance.com/userfiles/file/93265670768.pdf
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/16072f9ef587e8---kamal.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cf3408d9---peweladedidigejopuzifewon.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a0cb591f1---jigumumulozonijorupejuv.pdf
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607458919cf11---nisoperesagawedizudur.pdf
    • https://stiff.pl/ckfinder/userfiles/files/10350024790.pdf
    • http://elesi.eu/fichiers/files/12988936581.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/10082270258.pdf
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/38fa5e379952831656d682b5d49080cf/gefelaximefawip.pdf
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160715f4c08a94---kagijofevijifobimo.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83914888f---26327480223.pdf
    • https://go2germany.ru/files/file/78469054606.pdf
    • https://dienlanhhonganh.com/images/pic/file/firininirojexelovel.pdf
    • http://biancoacolori.it/userfiles/files/gijitojikimumexod.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/d9c13e374c375ea3d19abd5a6d754d0f/31498155620.pdf
    • http://hebertfamilyreunion.com/clients/3/32/3272330ca4c68e8b1120eb7f178c7a05/File/7200526985.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=make+you+be+happy
    • 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_off0000d37f.bin
acf053bbe4af4efcd7e4dba51c4c1eef8f643305f5758f4bf3ca974791df025e
pdf-font-stream PDF embedded font (sfnt) at offset 0xD37F 16604 bytes
font_01_sfnt_off0000fe98.bin
51467f3c20dbdc549357884017f5737a4f6d78cb08ae577d718545a4c68ab8f3
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE98 3548 bytes
font_02_sfnt_off00010d06.bin
7acbfb1124fbc5bffb9c175c9b8ffae2f6de3ad09eb57d9adbadd2e4bba2fcdb
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D06 10180 bytes
font_03_sfnt_off000123bb.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123BB 16792 bytes