Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ceea05b4113e58a…

MALICIOUS

PDF

69.1 KB Created: 2021-09-19 17:49:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 704854057315c018c5a5e7191f9ef558 SHA-1: 53028a2143ea3eb6fcec7fd339f61de7d940dcdc SHA-256: 4ceea05b4113e58a43d8516be9b0ba006a0e1dad1211efc6b083c5e654d44100
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing lure. It contains numerous links pointing to external domains, many of which appear to be compromised CMS upload directories. The heuristic 'PDF_IMAGE_LURE' suggests it's an image-based document with an action trigger, typical for hiding clickable phishing elements.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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
  • 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 69 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.
  • 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://synerhu.ru/uplcv?utm_term=geez+amharic+dictionary+pdf PDF link annotation
    • http://yourtruck.be/upload/ckeditor/file/larexobozabizejezefa.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/36913861578.pdfIn PDF document text
    • http://rudolphi.nu/userfiles/file/74953828930.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614408231a17b---vunumemumex.pdfIn PDF document text
    • http://mrybalko.ru/files/74529069983.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/21932848727.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613a293cde4df---dajekorawevuj.pdfIn PDF document text
    • https://anaksemut.com/contents/files/xifijovamukolisa.pdfIn PDF document text
    • https://gyn-koe70.de/obrazky/file/91764717478.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/sisevewojelirojinolemu.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16146b2bf48535---xijixub.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/23062561473.pdfIn PDF document text
    • http://gainliving.com/upload/editor/file/zofejunaxabutufibef.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/legiminowawizozanas.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137170213297---80396312859.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/zujefupipiwidirituponen.pdfIn PDF document text
    • http://intertravel.hu/_user/file/kewuvoxofajanokakuzep.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/89920758918.pdfIn PDF document text
    • http://roocenter.ru/upload/file/51281974206.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/bibotisefosetimolo.pdfIn PDF document text
    • http://remont-etalon.ru/upload/files/xosuwowawox.pdfIn PDF document text
    • http://rts-3.ru/upload/files/70817939100.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/70136928056.pdfIn PDF document text
    • http://seyrimerdin.com/userfiles/file/73848895597.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/dexagepa.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/28485647151.pdfIn PDF document text
    • https://aneri12.eu/res/file/zawowi.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_off0000b2db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000caf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAF2 10884 bytes
SHA-256: a33c3dd8b2f2f9fc14ca722886971b4d60e8c047328ad61ecc9928c6fd64fc12
font_02_sfnt_off0000e3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FD 13940 bytes
SHA-256: b6d3a2b723edcb74d06d55795d7727e05945b01a58ec67dba578fadff210b6a8

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