Malicious PDF — malware analysis report

Static analysis result for SHA-256 c52ce822ab4fd61c…

MALICIOUS

PDF

133.9 KB Created: 2021-07-22 16:25:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 584d3f928bff378b1ef1642817ad843e SHA-1: ad44e1c7bb5506c13218a6148944e2624797e4c8 SHA-256: c52ce822ab4fd61c1eb8475409de91e0ea2265838542559fdbfe7ad40cbcf663
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, potentially leading to further malicious content or phishing attempts. The presence of embedded URLs and the detection of a callback lure indicate the document is designed to deceive users into interacting with malicious links or making fraudulent phone calls.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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 http://sklepjola.pl/userfiles/file/58347684344.pdf In PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160981668604ed---nuvawitus.pdfIn PDF document text
    • http://cosyromania.com/media/file/69552473385.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/jowifujusenopukuxagifosaj.pdfIn PDF document text
    • http://akademia-jedenastka.pl/zdjecia/fck/file/luduxaxolizasevufevuwi.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/tqdlnvqcljvqe86nnqmfa7jq8u/moxuvovaz.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dbb696632f---famazekesaxu.pdfIn PDF document text
    • https://centrobrands.com/wp-content/plugins/super-forms/uploads/php/files/d7d478e6b66b713ae48432f1dfbf1389/28993161535.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/88304658912.pdfIn PDF document text
    • http://www.adatechotomasyon.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b8dd3c872e7---6412515199.pdfIn PDF document text
    • http://cafehinglung.com/uploads/files/durozonile.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/b8f4259eb58cff28d31a31e9361f20ca/mifidojezo.pdfIn PDF document text
    • http://abacusnancy.com/userfiles/file/94131883502.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/kabefaguwapi.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe338b3fb---67617617686.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32534473ce---7266500123.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/jirup.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da395db1ecb---ligabajusuxuxore.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160901ef7ea837---99159255933.pdfIn PDF document text
    • http://xn--22cjbbm2eyae3ehabdb4kqdtae3dxnnc1fhf.com/user_img/files/posurit.pdfIn PDF document text
    • http://finproekt-msk.ru/userfiles/file/wewevagi.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d29175e3f---54932081516.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/38022578869.pdfIn PDF document text
    • https://ekransamara.ru/files/98280563157.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/31835891378.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/zuvipivoles.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=girlfriend+activation+system+free+pdfPDF link annotation
    • 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_off00018c8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18C8C 20072 bytes
SHA-256: 64ff5b4f9cb18995047eec94968b3342e6852d084476993b079dde98e3bf94a0
font_01_sfnt_off0001c040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C040 16312 bytes
SHA-256: 7d15b2d6d265aaca51dda18faee70a1b8fa9d95ed54cb111fb0895789092f9ae
font_02_sfnt_off0001d64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D64C 11000 bytes
SHA-256: 4b8a9f84f7d723bd8bcc32b18171ea8c68320c8d40c68be38e6e2728db381be1
font_03_sfnt_off0001efe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EFE6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.