Malicious PDF — malware analysis report

Static analysis result for SHA-256 be443edb4b6a90ca…

MALICIOUS

PDF

82.4 KB Created: 2021-09-16 00:47:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c513aa0c7a837f9293c01a8a44d91e37 SHA-1: 936841b7fa607c6e3d7ba773aa33563b15d24f21 SHA-256: be443edb4b6a90caed2a448741a8e1da93089779eca23b665e18dbdfbfbe45f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a Pdf.Phishing.Trojan. Heuristics reveal it functions as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious intent, likely related to spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://acelybio.com/upload/files/xedavasibigusupotoj.pdf In PDF document text
    • http://bkm-market.net/userfiles/file/pudafanowarovikisi.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/22911662750.pdfIn PDF document text
    • http://danchrisjewelry.com/userfiles/file/dufonilotud.pdfIn PDF document text
    • http://maiodi.com/userfiles/files/62436184517.pdfIn PDF document text
    • http://www.hon-ro.hu/userfiles/files/nimupulopuneluruwasos.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142645122599---81072196679.pdfIn PDF document text
    • https://scalping.ir/data/files/file/nupinejofimamipigegokup.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/085e26b9ae4153d4531e32fae234aecc/81831612521.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/cb88defa1ee469d47b593ddd16904301/dowarubebezowofirofozufo.pdfIn PDF document text
    • https://amityhr.com/userfiles/file/58483436025.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161341ecfe3bfe---zinewaze.pdfIn PDF document text
    • http://diamant-x.sk/UserFiles/file/nalusado.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/sauep2kjrprfr7ftaq2qrcme12/99880079561.pdfIn PDF document text
    • https://geniodelweb.com/file/54047881213.pdfIn PDF document text
    • https://supermagnum-bg.com/userfiles/file/99100277456.pdfIn PDF document text
    • https://pabxlg.com/userfiles/file/21201804612.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/ruwos.pdfIn PDF document text
    • https://mimpisiluman.com/contents/files/12651086417.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/87115242799.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/51652462fc404b9e11a3c8dfe1dee07d/nemeroji.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/84056057287.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=sqlite+viewer+androidPDF 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_off0000d860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD860 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 10444 bytes
SHA-256: e9e45ef5295c5118c741abf14db4b6c893f281c730c0fa8954550e1f2f57bd8e
font_02_sfnt_off0001081a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081A 19716 bytes
SHA-256: 1cbf051abf30e136143bbf3027bd8adb28f3440a4ad0d1b192aa46eedfee5e53

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