Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a89c7be5134d9c3…

MALICIOUS

PDF

84.5 KB Created: 2021-09-10 17:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 1baae7e2511fd55fadfd8a8ff7721fc4 SHA-1: 71951a58c2736376f23fc2133a6330964d15a2a0 SHA-256: 7a89c7be5134d9c30a70523b4cb12966f584a0ab2adcff85da12740d7d1a4eba
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, several of which are hosted on compromised CMS uploads or appear to be part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The PDF document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the presence of embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://hrampetraipavlavosstanovlenie.ru/content/images/user/file/46680630026.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/bujovonelufufefinepev.pdfIn PDF document text
    • http://rs-entp.com/upload/file/vurunosi.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345523c6e9a---diribipamawitumikuputul.pdfIn PDF document text
    • https://tmtteks.com/files/vobajijenawavupuxugaben.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/28be1b0678bceb6e9c6ef32ee8a85c00/bonexuruk.pdfIn PDF document text
    • http://okuninka-biale.pl/userfiles/file/rasefirojow.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/42900582855.pdfIn PDF document text
    • http://boldogelet.hu/media/9493933367.pdfIn PDF document text
    • http://onroerendgoedindex.nl/images/uploads/19640546260.pdfIn PDF document text
    • http://tjsijiqing.com/ckfinder/userfiles/files/2021/0907/8f70181380681edff524af23ac14ab53.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/bodevad.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138b07f2846c---joxojesurupukupifox.pdfIn PDF document text
    • http://77owship.netsociality.com/upload/files/bokilujipilaf.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/fapodubaduxoriton.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16132aa6ac422a---49901956342.pdfIn PDF document text
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/rovalemodake.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/bekejokufejasaminud.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/dupigezivetubag.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/33b2c5eb8521772b4e63587fae451c72/35938015639.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/varitagilokisivetidonak.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16131631af0d76---65737286276.pdfIn PDF document text
    • https://medosojewellery.com/userfiles/files/53892578593.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/fexadumadujirazubuwagom.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/kotofevubijebu.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/pefaxadi.pdfIn PDF document text
    • https://otoform.com/upload/ckfinder/files/60572734509.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=mirzapur+2+free+streamingPDF 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_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 17476 bytes
SHA-256: 866e363b528e5dc815ac31f5215271efeb862cc82c06d30233550aa87a108f3c
font_01_sfnt_off000112e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012afb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFB 10808 bytes
SHA-256: d90a15bf26d55c151a4f21366827976dba6d4b6aeca3dbdca8ef083064e7d69c

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