PDF malware analysis — malicious · 493d73179533b493

MALICIOUS

PDF

82.2 KB Created: 2021-09-09 05:00:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23

MD5: 0b1214079de7a6091a182671303be939 SHA-1: 2b552ea35ff754b506c901de19683bebeee704c2 SHA-256: 493d73179533b4934ce29bc2ff2317e4c72a1d824d61742b151125c860415dad

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF acting as a link farm, directing users to compromised WordPress uploads and other disposable hosting sites, suggesting a phishing or malware distribution scheme. The presence of embedded URLs further supports the attack pattern of luring users to external malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9974

Heuristics 6

ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
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://catamma.ru/uplcv?utm_term=ios+rpg+2021 PDF link annotation
- https://happyjourney.webtrails.in/ckfinder/userfiles/files/kedudajuziborozorotap.pdfIn PDF document text
- http://gzhangqin.com/uploadfile/files/92791811738.pdfIn PDF document text
- http://hcwan.com/userfiles/file/dotino.pdfIn PDF document text
- http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/161350b6fa135d---kalojusedoziwite.pdfIn PDF document text
- http://apexibd.com/uploads/fck_uploads/file/loridugebubenivuze.pdfIn PDF document text
- https://www.vignolaweb.it/ckfinder/userfiles/files/fijujavokirutitoz.pdfIn PDF document text
- http://taigesw.com/upload/files/39283201204.pdfIn PDF document text
- http://vekosgroup.ru/userfiles/file/8894301599.pdfIn PDF document text
- http://be-now.pl/userfiles/file/tajedasusugekudenonolapit.pdfIn PDF document text
- http://hieuchuan.com/upload/files/pirugogubipawov.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130cbc5106c6---jijufozam.pdfIn PDF document text
- https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16132f76812b06---18567685963.pdfIn PDF document text
- http://lulanjina.net/upload/files/sezenububobaxesog.pdfIn PDF document text
- https://sikahaiphong.com/images/news/files/71183942282.pdfIn PDF document text
- http://usaoxin.com/userfiles/2021-9/file/1769420754.pdfIn PDF document text
- https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394d627c026---mivixizenifujuxixepida.pdfIn PDF document text
- https://electrodomesticaruano.com/images/ckfinder/files/xefibutujomul.pdfIn PDF document text
- http://miskolciharsona.hu/pictures/file/8795331764.pdfIn PDF document text
- http://dominoliberec.eu/images/file/files/pojusixizukez.pdfIn PDF document text
- https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/161392c99c433e---48497827050.pdfIn PDF document text
- http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/0frq87kfjdfcr0lv7390p3h4po/lubitokomed.pdfIn PDF document text
- http://pogotowienaukowe.com/Upload/file/nexotawosikavugi.pdfIn PDF document text
- https://forexinc.ca/upload/editor/file/bovemokewumaf.pdfIn PDF document text
- http://imbirimbir.ru/files/wunifoliwajosugode.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_off0000e219.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE219	16600 bytes
SHA-256: `bfa364b49c3ae4709be21c30eadb6d6225eb2a85e9007e7279f4b3790784b624`
`font_01_sfnt_off00010cdc.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x10CDC	10036 bytes
SHA-256: `08368142675655acc8b8d8c2449f2d574069283e0b0f082216f247773609543a`
`font_02_sfnt_off00012343.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12343	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`

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