Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4a31b885af8bf8…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 21:20:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: fa4e425eef61938e11da4287ed505fd6 SHA-1: 5d6146563e63857ab251340072a8f54f6608c591 SHA-256: 1b4a31b885af8bf827e469d353de3855dcb44390bba6b3cf53fe4f27bbaf6dec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised WordPress uploads and disposable hosting sites. The primary purpose appears to be directing users to external, potentially malicious content, aligning with phishing or credential harvesting tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.almuhja.com/ckfinder/userfiles/files/gokonisodufasamepaba.pdf In PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160b957f8b9e09---dokeguxikakamasupo.pdfIn PDF document text
    • http://www.chatanakonci.cz/userfiles/file/litimigeji.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b863d412e79---jirevibapitikisotalak.pdfIn PDF document text
    • https://calmoinc.com/upload/editor/file/kunamawetoguraxufenipupo.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/tonudukiwojewisiweto.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612340a12e7cb---talizosepo.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/5eb455e7a43ef9ef457939171368da3b/65440377209.pdfIn PDF document text
    • http://eurolocal.info/sites/default/files/images/file/tejazisolot.pdfIn PDF document text
    • http://www.gunyagder.org.tr/wp-content/plugins/super-forms/uploads/php/files/1274vrsf22r4nfm8qkc0ns58a2/direpubon.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/vibukojuxawobiwubu.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160789bc235853---nokobevitupu.pdfIn PDF document text
    • http://nakamurasangyou.jp/app/webroot/uploads/files/9114579977.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c1f342c5f0c---6561013764.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/32c09f7a3d970483a2b36b619511f82c/jevujawigaroxebitikul.pdfIn PDF document text
    • http://florylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lonufetefininusot.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/41777483203.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/74019012188.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/poliq2edkhcf2vt0fpgit5150a/gasudovujutorifet.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/7604900d59dd1eb6e1ac809f0c27c117/34193578481.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/rawilomuvidagapo.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/zureloxudovaginogixikogi.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/63e47488dc5c98f385643bc98c9d0c80/lobamagaror.pdfIn PDF document text
    • http://thephinhmienbac.com/upload/files/68934146972.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=paul+ekman+face+of+man+pdfPDF 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_off0000de79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF690 10516 bytes
SHA-256: 6ad1e2d80e047d44341803410aaee7067a1181f6b320e2dc8d4eee0a6f121ced
font_02_sfnt_off00010e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E75 18268 bytes
SHA-256: 37fa77880e32134a3d80c7528876c4e409078c41a2d8e3871de86c1b8eb538e7

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