Malicious PDF — malware analysis report

Static analysis result for SHA-256 80e9eeee0199dabb…

MALICIOUS

PDF

71.8 KB Created: 2021-09-18 00:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f0739e211af622227416e929fe0b495e SHA-1: 5c7265cf0911bb6e591ae1cb2965d4462f2fc6c6 SHA-256: 80e9eeee0199dabbd80c38d81b1d5224f75459b9899b1a275c030217d35426fa
176 Risk Score

Malware Insights

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

The sample is a PDF document that exhibits characteristics of a callback phishing or tech-support scam, as indicated by the 'SE_CALLBACK_LURE' heuristic. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or redirect users. Although no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the exploitation of PDF vulnerabilities or social engineering to achieve its goals.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://htapigroup3.com/contents/files/kozofofowekopazululiro.pdf In PDF document text
    • https://propiedades.net/ckfinder/userfiles/files/99867059131.pdfIn PDF document text
    • https://martan.es/cenavarra_userfiles/files/53236733963.pdfIn PDF document text
    • https://viceda.com/userfiles/file/gugoko.pdfIn PDF document text
    • https://thehouseproduction.net/file/60371893754.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/sebupopurokopoval.pdfIn PDF document text
    • https://ww150001.linebot.net/upfile/files/20210912175009.pdfIn PDF document text
    • https://okna-kursk.ru/page_edit/_samples/userfiles/files/86183052524.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/a7ke0v9hjjvfnb69099m4786md/47827103437.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380a41a05db---ribawa.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/xoruxifosipevaf.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/26482773801.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/fbd0f410700ff03386e10e55b2c8ccd6/21109683518.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/jigamubokegebew.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/rizoro.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/rinitatof.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/3e49gacn5cvktq8naagmck0sf5/7273871443.pdfIn PDF document text
    • https://suprastoc.ro/userfiles/file/7886145480.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/36890033868.pdfIn PDF document text
    • http://sameiroeventos.pt/ficheiros/17982805298.pdfIn PDF document text
    • http://vladekoservis.ru/files/90935997739.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210907132952.pdfIn PDF document text
    • https://robodom.si/files_vsebine/gipaj.pdfIn PDF document text
    • http://lammensfilip.be/uploads/files/89457918403.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/7340504358.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=wifi+password+master+key+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_off0000b628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB628 16596 bytes
SHA-256: f96f8257d39eefbb66b680956521c248b3dc8a5b5dac2426d753dd183774aca0
font_01_sfnt_off0000e0b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f8ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8CA 10792 bytes
SHA-256: 06049be45eca686a258767ae3a48144dbaf0f7934a34662964fd21ede64656c3

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