Malicious PDF — malware analysis report

Static analysis result for SHA-256 070baa2a7960f4d2…

MALICIOUS

PDF

83.6 KB Created: 2021-09-05 23:21:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c37ab6300cc1ef753aef18c45e5af656 SHA-1: 19f34e6bb64bb5934e32fd9c9b39b138ca323f4e SHA-256: 070baa2a7960f4d2832b2ba71ece12862080471048fa4dfae9f77e167ba8a623
156 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. Multiple heuristics indicate that the PDF contains numerous external URIs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to lure users to malicious sites. The presence of these links strongly implies a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://queure.ru/uplcv?utm_term=learn+tajweed+rules+pdf PDF link annotation
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/cd03f5qcc8caq52pugkp5n9139/nipubuzedamukogopitabux.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/bagofuvupefuzin.pdfIn PDF document text
    • http://dienlanhlongan.com/upload/files/74371036017.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/df84f048d8b1c79793fc9d481f23251c/felugekazevivotizinefow.pdfIn PDF document text
    • http://beta-rc.com/upload/files/88820381225.pdfIn PDF document text
    • http://belniig.by/public/file/91556439541.pdfIn PDF document text
    • http://solee.cn/ckfinder/userfiles/files/72878369803.pdfIn PDF document text
    • https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f2d9b8e81---55298046939.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1606d55d3c3eb9---momadegenesonejokoraxa.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/ruxotigigidowinij.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/21027454863.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/fiwoweliropowixudib.pdfIn PDF document text
    • http://www.zulfugar.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608d175729af0---71159371761.pdfIn PDF document text
    • https://belgradenightlife.info/wp-content/plugins/super-forms/uploads/php/files/6p8k1polns1mjm4vsd49v6e9ot/wivumoni.pdfIn PDF document text
    • http://firegallery.ru/img/upload/tapawukarajiwawer.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16105189eb4f0b---fubakodezixejuzit.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/novewaradevawimukubufeluk.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/zipape.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/ff3010622409499e3ffdc9ac07404bdd/xexexaliwenozonaxidis.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kedaku.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/wezisil.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_off0000d8ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8AC 21672 bytes
SHA-256: bd4abdd58d15837baa8e3b857dca599ecefc75811ddc296cc90ec5b5e83cd3f7
font_01_sfnt_off0001109a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1109A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000128b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128B1 10552 bytes
SHA-256: b9128e2029f6871751d9c30d50f0a4d6e2624bab143e2fb0b21625dbb5a09cd1

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