Malicious PDF — malware analysis report

Static analysis result for SHA-256 810ec34752b75509…

MALICIOUS

PDF

88.0 KB Created: 2021-07-23 19:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: a0d9c9ec3f03862d130d969f729e8cc3 SHA-1: 3ba5f3a97c1fef431a832229a466c4fb73257a81 SHA-256: 810ec34752b75509283d9f0b40b6e95501029b6168b8d8dd59c5879394e24fb2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some of which are hosted on compromised CMS platforms. The presence of embedded URLs and the nature of the link farm suggest an attempt to distribute malicious content or engage in phishing activities. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://hyundaia.ru/userfiles/file/nenufodunodugedisenelovi.pdf In PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/aqb1kmt2asgk1dk1q0tck2s5he/1431865366.pdfIn PDF document text
    • http://azstorestudio.com/uploads/files/gokupuvolusuruzadesovigi.pdfIn PDF document text
    • http://vintageguitar.ru/ckfinder/userfiles/files/paruzorisuliwokag.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/90692539175.pdfIn PDF document text
    • https://valserve.in/web/k/main_admin/ckfinder/userfiles/files/99280354590.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/rovofepilamozupeborojuvaj.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/70957189717.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/32128511343.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/2df3720171b64f99576b7d20f3ba82cc/boxazozelebal.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/12684826e8729a112a45deda7de21908/fovujulaxejal.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/u61a44jmnuv6bcdn8pf7hbeajn/16054531862.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083358edbe40---62436447183.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/43130778236.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/xamoxomipigavifowe.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/3s00rbca5glknimac1m7h03av8/48425021725.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/3ks9a981cf5t93dgu5pe38m0aq/zazevijuviduvaforiv.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/cdb10146223fbd03b18c2214b4c5af6c/4063335872.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/b1005eef4a9a133a6809dfe45c757fbd/51302133177.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5e12c1639---2234233690.pdfIn PDF document text
    • http://myshopekerala.com/userfiles/file/bolalobololizikudure.pdfIn PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/f967cfd02b46ac923ded65f74d40472c/zokezumuburufuwinina.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/pevanoseju.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/fq6sg0dnvv2cp7r62tgembqkg6/90275294593.pdfIn PDF document text
    • https://workinhotel.com/upload/fckfile/26338237685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=simple+logo+animation+after+effects+free+templatePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C6 10896 bytes
SHA-256: e0c52aa01b41e55ffecb0f7212b5cdfb40f50ccefb269b01bef17e2c43fc3cc2
font_01_sfnt_off00010ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DED 16748 bytes
SHA-256: 5eb38694652a83dd0f0727932cbec131dcfa787fc25f02fbccf9b8a25cf9e1e2
font_02_sfnt_off0001395c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1395C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1