Malicious PDF — malware analysis report

Static analysis result for SHA-256 81930cb1261c4c97…

MALICIOUS

PDF

164.1 KB Created: 2021-07-26 02:41:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b3b65b4c629cce974336e3c28603b8af SHA-1: 03908fd3c94fb746fd4776be9be38093f3278803 SHA-256: 81930cb1261c4c97298c46c1d092b8946b845178cb0d12330805bcd55f00a169
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, many of which point to websites that appear to be compromised CMS uploads, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is unreadable binary data, providing no direct clues to the user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://24cvety.ru/upload/files/dafanafunogogetasefa.pdf In PDF document text
    • http://travelport.pl/userfiles//file/15758231049.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/50hj1rvbqpluudvm9e5gtjfp7q/24114178323.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072701c3c0d7---6197614080.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607191dd3fb03---40546930915.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/25a88fe7acc207b23274681d16ce4eed/kefabuvizebunab.pdfIn PDF document text
    • http://forresterfamilyreunion.com/clients/c/cc/cc72bfd2512333311cc1ef5a4fdef90f/File/92146342878.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/ecfee842724d5798b648c710817bad16/87236556705.pdfIn PDF document text
    • http://pumarecovery.com/userfiles/files/6822480689.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/32638957727.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b18ec80b08e---tefifuruxotolapiludosode.pdfIn PDF document text
    • http://internationalnetworksolutions.net/files/In PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/1bd630e6ef259f9ad7ccd24e4e94ae78/63133907297.pdfIn PDF document text
    • http://tapestry.cz/images/file/files/95835850938.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef70c231a2---94417100368.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/89299193094.pdfIn PDF document text
    • https://lecachet.fr/docs/files/gosigudukopina.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/xomojujojowobisifedakuv.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/budefojer.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0c43ba5bc---dolexexipepeneziwed.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160862bb3aa58c---62574437328.pdfIn PDF document text
    • http://elitvorota.ru/f/file/42403209323.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/ks1vl82fl9h2i4i0ru9fadvl45/43087240151.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=speakout+upper+intermediate+2nd+edition+myenglishlab+answersPDF 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_off0002199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2199D 11564 bytes
SHA-256: 7fdc6444f1e849cb5ec56b5bd77cf5753857f2537b0b67cfafb8294508a99488
font_01_sfnt_off0002348a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2348A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024c9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24C9C 19696 bytes
SHA-256: d444f5a8ab148a9807ec3e232e1c746dfd0a0dff39692a3a152593c2fa25086f

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