Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4995e228054337a…

MALICIOUS

PDF

81.2 KB Created: 2021-09-14 14:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 37183a56204962e2a00f25d32d437d08 SHA-1: bbf6686b94237f2a0f424dad5dcb1e862901a85a SHA-256: e4995e228054337a0fbb378d87dbd27eca5aa6b3945e2a6306538df67e626751
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it is a link farm and a callback phishing lure. The document body is heavily obfuscated, but the presence of external URIs and the 'SE_CALLBACK_LURE' heuristic strongly suggest a phishing attempt where the user is prompted to call a number. No scripts were extracted, but the PDF structure and URL patterns are consistent with known phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=omnifocus+para+android PDF link annotation
    • http://sensi-leszno.pl/userfiles/file/zugegatupil.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/ed7c056469f421d978ed4ec01262a302/74797253490.pdfIn PDF document text
    • http://cyclad.org/UserFiles/file/87674550289.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/f415a37fbaee59d0e61a43e7a0dbd96e/buvek.pdfIn PDF document text
    • http://etcpremium.com/userfiles/files/95433976318.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/56400327539.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/72590458849.pdfIn PDF document text
    • http://biosite.ru/images/news/file/kazuku.pdfIn PDF document text
    • http://zonazero.es/userfiles/file/22205151473.pdfIn PDF document text
    • http://xn----7sbicwad4afgcgd5aph7d5e.xn--p1ai/ckfinder/userfiles/files/venegosumalotexi.pdfIn PDF document text
    • http://progettarecasa.com/userfiles/files/2146979475.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210911174956.pdfIn PDF document text
    • http://torremaggiore.sitmap.it/files/files/60332639149.pdfIn PDF document text
    • http://majedalkarkhi.com/pics/file/59073339425.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/75545305096.pdfIn PDF document text
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/161369643d4938---pevagev.pdfIn PDF document text
    • http://adice-area.com/pictures/files/81959422856.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/654321f167ca4bb957a0691ad642134d/lamagek.pdfIn PDF document text
    • http://excitechem.com/userfiles/file/mijasuwofono.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613867dc71f89---jumojekegifunakejet.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/89593331256.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/vk3mrk218e63kj9oqqitp1c02l/85227021562.pdfIn PDF document text
    • https://petrovsky14.ru/docs/files/67570543928.pdfIn PDF document text
    • http://kramnyca.info/img/upload/editor/file/domofezaso.pdfIn PDF document text
    • http://marikitaberbagi.com/userfiles/file/dizonagutubimobitibefuvo.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_off0000d952.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD952 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f169.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF169 10628 bytes
SHA-256: 72ac74e5c6afecdeb8faf6dfbeb2f3dcb2da7ca4868af674948b9e9129b9958e
font_02_sfnt_off000109a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A3 17884 bytes
SHA-256: 17c5dd0e90e7a95e49b332c84f66fc74d0cc40bd5a9fddc379b2fc3a202fef8f

Open this report in the interactive analyzer, or submit your own file for analysis.