Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea715cf620aca3b…

MALICIOUS

PDF

83.6 KB Created: 2021-09-02 12:12:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f72a0d5f9ef3c01eb7d7ee746d1ed4fc SHA-1: d656a112f411ea9cd68486598bc3ae843d42f56c SHA-256: aea715cf620aca3b50b8469a333fd39ce88a3cc361940eb0dda91f418ac9d293
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF detected as malicious by ClamAV and an ML classifier. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The PDF's structure and embedded content indicate it's likely part of a phishing campaign or a distribution vector for further malware, leveraging the 'Spearphishing Attachment' technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://laborke.ru/uplcv?utm_term=allen+key+sizes+in+mm+pdf PDF link annotation
    • http://fullx.net/files/letifobakozomanamukevav.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/74290214871.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c5effe4d9f8---xuvokawak.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/97fb40a5fd775768172dcd9ea602d4b6/berif.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/76981121438.pdfIn PDF document text
    • http://iamsong.vn/uploads/files/momabafiwixonotog.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/nagolinavufimen.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0640f01e19ac92baec140109d8624ede/novixemijukezuvexosiwatun.pdfIn PDF document text
    • http://xn--90aoaidn.xn--p1ai/ckfinder/userfiles/files/joretabixasefozajoket.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/78198908431.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608aebb6c8269---mexowugitudozugisapel.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c38b903b901---wofasodolumaxizisonarolog.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/wamapaponizovu.pdfIn PDF document text
    • https://ladangmimpi.com/contents//files/25759925358.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/vinedikamajunopogil.pdfIn PDF document text
    • http://inarchengineering.it/userfiles/files/wapozosivuxelo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/roa5lm4ms066p6bkq44jqdk8fo/pokazagurapebeb.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/161250551d901c---50254991381.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/44790136182.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/doxuponenabukamonipuwiw.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/tototitopimaro.pdfIn PDF document text
    • https://fallsplat.se/bildbank/file/loribajisujitub.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_off0000e1e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f9fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FE 10424 bytes
SHA-256: 92ec7f79ea11d6847a4170c7e8097c19cb0482355f9718719fe31a282b96d3e7
font_02_sfnt_off00011199.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11199 18316 bytes
SHA-256: 19c3c6de8387fc1606e81df70c17423aa248e6e15452973bb91a15e614f935aa

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