Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddaa1367f4bbbc97…

MALICIOUS

PDF

90.8 KB Created: 2021-09-15 00:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3abc250ca49615ffb3592de78721534c SHA-1: 30ccbb7b2812ee53c7293182f9c4759f1c8f5797 SHA-256: ddaa1367f4bbbc97af10fa16c4c27f8aa0c4db14ce8233a87c24ebe36242307c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of a 'Password-protected archive handoff' heuristic suggests the document is designed to trick users into providing a password to decrypt a malicious payload. Numerous URLs pointing to compromised websites and disposable hosting are present, likely serving as download locations for the secondary payload. No scripts were extracted, but the overall pattern points to a downloader or dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=how+to+crack+android+password PDF link annotation
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161354b8d2f912---89016831004.pdfIn PDF document text
    • http://flirdining.com/uploads/files/texazusapaselututoba.pdfIn PDF document text
    • http://dichvumucin.com/upload/ckupload/files/39427130567.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/84a91vg0ema83bod1ral582brf/81770862178.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/gumazubapuju.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/wovosivedebo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jalq59nhplb3fr2r4r5vb94n8u/96824277543.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/76602358706.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-6/20210906175002549141.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fbf80aecdb---78801229514.pdfIn PDF document text
    • http://rambud.pl/uploaded/file/2011873949.pdfIn PDF document text
    • https://inks.bg/userfiles/file/33253140740.pdfIn PDF document text
    • http://hig-hegmann.de/userfiles/file/57470736565.pdfIn PDF document text
    • http://dglytbt.com/upfolder/e/files/20210910030704.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/53226851769.pdfIn PDF document text
    • https://cpsguffanti.com/uploads/file/64459093693.pdfIn PDF document text
    • http://shiraz.sk/ckfinder/userfiles/files/zofokurefi.pdfIn PDF document text
    • https://micsys.in/userfiles/file/zuxabirojen.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/161410eed57fb5---71841356462.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/siruv.pdfIn PDF document text
    • http://moristas.com/userfiles/files/81733386209.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e13a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13A 18048 bytes
SHA-256: 572598f60e2092e052b773602296c4a635a757f0234acdc054724abfc45d3f09
font_01_sfnt_off0000fd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11551 10496 bytes
SHA-256: 8e327bb4b5d0b89fd75f68f45538ea4f2fecbb0946ada1aec8b0e0d24e134000
font_03_sfnt_off00012d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D50 18504 bytes
SHA-256: 732bd7d7c8bfac3d3701f65783a4f39efcab0b00102b2dd6ebcf3b9e50e0f0d1

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