Malicious PDF — malware analysis report

Static analysis result for SHA-256 38d0286fa56bf2b6…

MALICIOUS

PDF

87.7 KB Created: 2021-07-14 00:49:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c50b9bc38fdc5a5bea34dd741a46e4ae SHA-1: 159bdc680f81787f1375b674eace948a4eaa7a71 SHA-256: 38d0286fa56bf2b6403442faa39afdaa6de7729ae8f15376386bc25d4ce0a972
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised WordPress sites and other domains, suggesting it functions as a link farm to distribute malicious content or conduct phishing attacks. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://cructi.ru/uplcv?utm_term=calcium+oxide+dissolved+in+water PDF link annotation
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bdeb43def03---1099064831.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/7cbedb244766bc47cdb9a9636c24fc42/10739928432.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/591759eacd44a73844bbe1bd694aa21f/kaxurijetawiwasebokafit.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/rizafowareg.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/c220a7785905d36756523acc13a5cd0a/18139985084.pdfIn PDF document text
    • https://ksuskalology.com/images/file/mofoxoxuvilibemavoxe.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/niwobosepego.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1623390689.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e10d6164d7---96170008808.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/wafiwalimemupefo.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/op3bebf83gnav6f6gcljafglv8/18891057578.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/27615013433.pdfIn PDF document text
    • https://jbdclothiers.net/emailer/userfiles/file/19764690972.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/vavagifuzujovuk.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/gazemonop.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160b66d0984318---33845475393.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/e0an6oieaeul0aif7jlieqsmn7/kabukezif.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/vmio530dk1744se29dn8jik903/lezubakivopigufonififoz.pdfIn PDF document text
    • https://alarrabnews.com/images/content/content/file/90147266953.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/84459252460.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084458e1082b---34536235346.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/857336994db2ef4e0ad1fbd3d7dbdd23/86469865953.pdfIn PDF document text
    • http://s292376414.onlinehome.fr/datas/imgmail/file/52875225180.pdfIn PDF document text
    • 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_off0000f243.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF243 17060 bytes
SHA-256: ad4f23d7f46179a12801458e174349d9f003aa6f21886a3725c161e8aece00ab
font_01_sfnt_off00011ec6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136DD 10916 bytes
SHA-256: e70864a3769ea9b365132bfc9755dc728310f2613f2dc3c31bbb375854a5254c

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