Malicious PDF — malware analysis report

Static analysis result for SHA-256 85af21a870dbd9b5…

MALICIOUS

PDF

68.4 KB Created: 2021-09-17 11:12:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7e3a5cdc5a6d2babe3d5b2c6855667cc SHA-1: cacbcc334508297016bf60952ac00da3ad200688 SHA-256: 85af21a870dbd9b5c094f727f9af09dab4466932ef0e18deb5542c1dee778eb9
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many pointing to compromised websites or disposable hosting. The heuristic 'PDF_IMAGE_LURE' suggests it's an image-only document with an action trigger, typical of phishing lures. The embedded JavaScript likely facilitates the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://jordan.si/dokumenti/file/5140638474.pdf In PDF document text
    • http://thoitranglani.com/upload/files/50262233319.pdfIn PDF document text
    • http://neurooperations.com/ckfinder/userfiles/files/90371740055.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/161365d850bc48---zajek.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/jafexinozoxutifariwanoziz.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/42355512042.pdfIn PDF document text
    • http://geotersrl.it/file/zonijuluwoliramo.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/8a5b8869dc57001ccd52fd48514bbd0e/xugife.pdfIn PDF document text
    • http://stomerijindex.nl/images/uploads/88464754400.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141bbdcdd498---12313788574.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/rudamefagedegasonuj.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/rolobifebizabalosojis.pdfIn PDF document text
    • http://thuaphatlailongthanh.com/upload/contentFile/minhchau/file/17222403915.pdfIn PDF document text
    • http://inter-travel.hu/_user/file/monogusumikuwe.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/14f559347fa5c4b106133adb3258dfaf/fifisarosodabebiwibefofu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/ec6690a32c9b429ed3d0d3df8aa6bbd1/598051929.pdfIn PDF document text
    • http://xn--80akazwaeiw.xn--p1ai/editorfiles/file/35301672246.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/83811675735.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/47808999802.pdfIn PDF document text
    • https://badoza.net/userfiles/file/97825870661.pdfIn PDF document text
    • http://aybar-gallery.com/userfiles/files/81732974069.pdfIn PDF document text
    • https://nurea.se/currency/userfiles/file/8564621933.pdfIn PDF document text
    • http://train-in-japan.com/images/blog/file/fezajijerabadixavowif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=temple+run+2+spooky+summitPDF 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_off0000b1ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1FF 13664 bytes
SHA-256: 9862539cea2f855c489a090d8006251e8080092121a7848b32b49181f5bba1c5
font_01_sfnt_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 10640 bytes
SHA-256: ce954ac464e02a3610473a21f419a8ba4f3ee8774981f3e5448da7dc2e8c8ee6
font_02_sfnt_off0000ebfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1