Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd28e26668187f9d…

MALICIOUS

PDF

74.5 KB Created: 2021-10-11 03:00:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e8487f26d11450fb6f5c0119d019a4ab SHA-1: 92eb52accfed8ff65a38fe147782465379a7279a SHA-256: cd28e26668187f9d742b6882d6dbb863ee3c181c58dbd68c14e29c3d7e869e99
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits multiple high-risk PDF heuristics related to external URL links. These links point to various domains, some of which appear to be compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure itself is likely used to obscure the malicious intent and deliver links to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://drafthe.ru/uplcv?utm_term=bible+names+that+start+with+j+for+girl PDF link annotation
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/83adfc304182a32c6f4f6d9d3dbb56c0/87528996732.pdfIn PDF document text
    • https://heks-tech.com/app/webroot/userfiles/files/kimagugipuvigevagugux.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/ledosudajafe.pdfIn PDF document text
    • http://cafegreenwichvillage.com/uploads/files/tuzapiximelapomidafezije.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/80950677626.pdfIn PDF document text
    • http://ergakiland.ru/files/files/nugogarurijababesuvazag.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/kigixipoxabenoxaz.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/16155b1c25871b---51688482231.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/27854656980.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/39f31ae31a1e695890d9972d6cb5d699/wosekore.pdfIn PDF document text
    • https://radekslodkiewicz.pl/files/file/nasekawixerekeleta.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/62212456968.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b46d929c6---kesemoreken.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/59020396741.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/xigupezugogaxukamunaturaj.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/mupebadozotodezomapujom.pdfIn PDF document text
    • http://konstruktor33.ru/app/webroot/files/files/gutususipasinexiv.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/luvisu.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/1b0c42437c10e4386644a4c9c23207f9/90518025379.pdfIn PDF document text
    • http://aguito.madteam.net/ckfinder/userfiles/files/6464913995.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/gawedufafama.pdfIn PDF document text
    • https://sgicorp.com/userfiles/files/87750109489.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cba50dd879---22104663443.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_off0000c081.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC081 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d893.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD893 16444 bytes
SHA-256: b9ad1b0a06e024f34bf47069a5a0069cee1a9b9ddb134ca5e87bbedf36ef079e
font_02_sfnt_off000102df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DF 11068 bytes
SHA-256: 1aae360339c612051cec913ec2d41f4459fef5614a15202f8b69f9a0f0334e7a

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