PDF malware analysis — malicious · 8aff3ad767bea4a4

MALICIOUS

PDF

83.4 KB Created: 2021-07-03 08:30:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14

MD5: a1cc8d9a61eef26d009e6ff9f04323fa SHA-1: 420585d6ec0537c1b75ba307bbc655d957d20aaa SHA-256: 8aff3ad767bea4a4e8e029b73e515919d5da59824f834303312345c7e61893c5

156 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites, suggesting a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by identifying the document as a link farm on disposable hosting, designed to redirect users to malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9860

Heuristics 6

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 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://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/e09fb2ed51d5991c18ba8988c0af6300/75428150526.pdf In PDF document text
- https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/1ec65khv4sr3vqil72c9trlp4n/ramanometo.pdfIn PDF document text
- https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a32d4bdcc08---87221138037.pdfIn PDF document text
- https://stellabakingcompany.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c933d1de0da---tozevora.pdfIn PDF document text
- https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/093ac75667da1376cb72dceb12155d26/xilitugakodaxunogu.pdfIn PDF document text
- http://tamker.hu/userfiles/file/wirisugajodetowam.pdfIn PDF document text
- https://www.lindopoint.it/wp-content/plugins/super-forms/uploads/php/files/5c2da0d7b2aa2277a6fcd177569ea893/dazis.pdfIn PDF document text
- http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43f1411004---34365908535.pdfIn PDF document text
- https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da69004ddbc---47703718215.pdfIn PDF document text
- http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb4e5b9f53---75744671769.pdfIn PDF document text
- https://fenixfalt.com/userfiles/file/mekajedojakikolesabibiz.pdfIn PDF document text
- https://edmaker.site/wp-content/plugins/super-forms/uploads/php/files/17359a0729b32a6931c0a993fba50edc/mosiw.pdfIn PDF document text
- http://essiac.cz/UserFiles/file/jifegixuretaramivapi.pdfIn PDF document text
- http://bvsaigonbinhduong.com/uploads/files/bakuxerogoxolizuxut.pdfIn PDF document text
- http://studioriggio.it/userfiles/files/rezakevolajafidoxid.pdfIn PDF document text
- https://www.tunnel.de/files/uploaded/file/vobaxilavufidujajepowepa.pdfIn PDF document text
- https://twr1115.net/files/fckeditor/file/27850400336.pdfIn PDF document text
- https://hyosungulf.com/uploads/file/vovunoxog.pdfIn PDF document text
- http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b0b8a97abcf---19295975798.pdfIn PDF document text
- http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/n52u5b5ue6g73loon68e6v2ks3/dizazilamutun.pdfIn PDF document text
- http://npxbyy.com/wang3_3_10_27/Upload/Upload/file/202162370145954.pdfIn PDF document text
- http://wang023spa.com/userfiles/202106file/2021062216004270554.pdfIn PDF document text
- http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160786020acff1---mexovibuluzozamunedexudi.pdfIn PDF document text
- http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa86c82166a---32780299115.pdfIn PDF document text
- http://garderoba.sk/images/_file/85877490617.pdfIn PDF document text
- https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=android+1+infinite+flightPDF link annotation
- https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/42aabcfa854d80bdd6afbd0c0f082fb2/36928139594.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_off0000e43b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xE43B	10336 bytes
SHA-256: `45e2b8b9cb0c014203365a543fcdb529d45c9c3c9f6ac16da464e3504a37797c`
`font_01_sfnt_off0000fb42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFB42	16792 bytes
SHA-256: `9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1`
`font_02_sfnt_off00011354.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x11354	17208 bytes
SHA-256: `d6b8a2d4ce993609311c3454dfb1a3eebfba13bb32e386ee961e3163ad1f89b3`

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