Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3a05e1ea3da48dc…

MALICIOUS

PDF

71.3 KB Created: 2021-09-27 11:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fa48eda56d7ac0e7a3bd7b955ac8c318 SHA-1: 3a84ab193bd59f92afce973ec36fa1c92b759c5c SHA-256: f3a05e1ea3da48dc685eb88fba691afb0694ffa5b9d5cb1c5df91e63a2fe17bf
156 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, specifically as a phishing or trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. The presence of numerous links, including one pointing to a compromised WordPress upload, suggests an attempt to distribute malicious content or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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://flightshop.jp/images/blog/file/81482840283.pdf In PDF document text
    • http://studiotecniconuti.it/userfiles/files/lubewetuxadanenuzaluvem.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/zezunem.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/79059835453.pdfIn PDF document text
    • http://grandioso.asia/editor_upload_image/file/zunulukapalasos.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/zosaredemop.pdfIn PDF document text
    • http://teakdeck.pl/files/file/39898848107.pdfIn PDF document text
    • https://laatuwhuisweerstralen.nl/upload/file/pivuwededadujelasuje.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/jutujajobuloge.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/mujozegujejikitusazefow.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/dudunemuledakofan.pdfIn PDF document text
    • https://wupaojichangjia.com/d/files/sogupejigexunije.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/16476371628.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161442bbb3fed9---vifomibivedeborowulogilov.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/161432422237b3---fejopuwatokanaput.pdfIn PDF document text
    • https://supermovi.com/userfiles/files/57247318981.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/99679541600.pdfIn PDF document text
    • http://wxdyzs.com/userfiles/files/jiwugalepevemezut.pdfIn PDF document text
    • http://tuanlongland.com/upload/files/pavekapewine.pdfIn PDF document text
    • http://sp3siemianowice.pl/userFiles/files/64568006699.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161513602cbf17---jafareferapefudezuga.pdfIn PDF document text
    • http://brbud.pl/userfiles/file/92246538114.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/juriwozajagodomuzozaruzu.pdfIn PDF document text
    • http://thedreams.cz/files/98943090030.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/kogisewudunizede.pdfIn PDF document text
    • http://neogmbh.de/www/sites/default/files/userfiles/file/69535719840.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=real+car+race+game+3d+fun+new+car+games+2020+mod+apkPDF 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_off0000b440.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB440 14872 bytes
SHA-256: aa52f6420f644712e1cc06875acb3d534779a0a5f510d95f47394ba326081d90
font_01_sfnt_off0000d9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D9 11512 bytes
SHA-256: 968fa33ec0a8fae25831abee75580f39496a0c926018467cbab125ac6cf6c389

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