PDF malware analysis — malicious · 3b0910c2a166d9a9

MALICIOUS

PDF

82.9 KB Created: 2021-09-13 21:34:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02

MD5: 8d8e418271a4266614bab83ed20f647b SHA-1: bb79226a9f7402c229f5d9e0cf98ed89c2522ead SHA-256: 3b0910c2a166d9a9fba676d61d3ad343cc84f665f1b0dbec321b78f8a24cd13a

196 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to harmful content.

Machine Learning

Nyx PDF Classifier malicious score 0.9846

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK

PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
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://huntic.ru/uplcv?utm_term=swf+player+apk+free+download PDF link annotation
- http://beerskiboot.com/img/upload/file/wuxexemodelujipolavivuxul.pdfIn PDF document text
- https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e931a9142d---40494177398.pdfIn PDF document text
- https://kawanmto.org/contents/files/44275250178.pdfIn PDF document text
- http://asremajazi.com/uploads/files/jojozewafotaxofaxijinaj.pdfIn PDF document text
- https://appvid.eus/userfiles/files/47365956394.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161310ec6a57ae---waduvuvedat.pdfIn PDF document text
- https://greenways.at/userfiles/file/ravajosuvet.pdfIn PDF document text
- https://billionbosses.com/ckfinder/userfiles/files/bejidonaxidolopovavi.pdfIn PDF document text
- https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133a643a7df4---goposuxono.pdfIn PDF document text
- http://electric-kernbichler.at/xenip.pdfIn PDF document text
- http://vuoncotichdep.com/upload/files/vifevulazilifomon.pdfIn PDF document text
- http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/0tp4kpoub73i5ka2pbe01alun1/86992579885.pdfIn PDF document text
- http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73a345faa---zugidibubokibosopenidadur.pdfIn PDF document text
- http://thaide.org/userfiles/file/gepibivagegepixor.pdfIn PDF document text
- http://kfnmdg.com/upfolder/e/files/20210903114917.pdfIn PDF document text
- https://cepatdaftargroup2.com/contents/files/22925796920.pdfIn PDF document text
- https://n-v-v.dk/userfiles/file/60877290040.pdfIn PDF document text
- http://geyikkimya.com/userfiles/upload/file/betedukunemolu.pdfIn PDF document text
- http://shinaval.ru/userfiles/file/49778532130.pdfIn PDF document text
- https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613588cbd5679---wuwopuxavijusupuw.pdfIn PDF document text
- https://childrencareandliteracysociety.org/userfiles/files/masezolixerujukezugot.pdfIn PDF document text
- https://littleitalypizzany.com/nbloom/fckuploads/file/zirojixitubitudejeguso.pdfIn PDF document text
- http://hotelgiottotorino.com/userfiles/files/zuxijodina.pdfIn PDF document text
- http://autowagon.it/userfiles/files/17346349128.pdfIn PDF document text
- http://buyyoutubelikes.com/ci/userfiles/files/fenam.pdfIn PDF document text
- http://gyermekhaz.hu/Content/site_images/files/duvigoximezenelirusibab.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.

Filename	Kind	Source	Size
`font_00_sfnt_off0000dda8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xDDA8	18312 bytes
SHA-256: `459c7c3f559b158ee4c5754656404f34f9616de69cf417ae52f1cd595640d4fa`
`font_01_sfnt_off00010d9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10D9C	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off000125b3.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x125B3	10500 bytes
SHA-256: `598eacd461e0f2bb45fad29704d6aaa13a0f4e1ee13bcaa02e77dab506f2eb45`

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