Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f898a1d3272cc1…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 02:06:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b2cf9c223795aca317356ad3a12d5044 SHA-1: e305dd03ec0936a4c976bca86a4b641938628a8e SHA-256: d5f898a1d3272cc199742b6ee706c9b70d18221d08693bd43490c8c3842dc883
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with numerous embedded URLs pointing to potentially compromised CMS upload directories. These links likely serve to redirect users to malicious sites, a common tactic for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://for-rent-antwerp.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140a8bee255d---xedutavoxezibofozos.pdf In PDF document text
    • http://stillincontact.com/images/mails/file/29229062997.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///xobijorefanixilofude.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433ac96fedd---46850969618.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/xekerekelofokedotusunek.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/68445448963.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/36288595596.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161359837366b2---99835802078.pdfIn PDF document text
    • http://website-design-company.in/dev3/damodar/ckfinder/core/connector/php/userfiles/files/kadipawopizukapapekepeni.pdfIn PDF document text
    • http://syntrend.critical.tw/upload/files/luxosonemi.pdfIn PDF document text
    • http://ajarnveerapong.com/UserFiles/file/jazibevufu.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/8976826f84bcea0f734cb551c4d702ad/xadugofajusotaduvile.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147a69098a11---foruseliti.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/limujavojinadamabape.pdfIn PDF document text
    • http://tarnava.eu/user_images/file/2244148849.pdfIn PDF document text
    • http://gocoachfox.com/userfiles/file/24657165567.pdfIn PDF document text
    • http://thuonghieutoancau.vn/uploads/files/28726429528.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/puxuxubugogovadenuvodoxur.pdfIn PDF document text
    • http://alptw.com/images/files/piritimamojuxudulefi.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/rovafumuribupur.pdfIn PDF document text
    • https://wildnaturetravel.com/File/2634988494.pdfIn PDF document text
    • https://0900107678.com/upload/file/wamix.pdfIn PDF document text
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/0f0a8effa6071e2a70fefed9fd4bc54e/lowotabujajugafepapuluva.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210920050657_8dfh7p.pdfIn PDF document text
    • http://goldenteriyaki.com/uploads/files/pefijirakenasamosob.pdfIn PDF document text
    • http://pzhjintai.com/upload/files/rivagebisenovemobekevo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=ipad+air+4+price+in+pakistan+256gbPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD2B 19064 bytes
SHA-256: ffa89e8463bde2fe89f2c3e02fa260adfac6b19dbb00c45e0d110b819f2cdf3a
font_01_sfnt_off00010e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E79 11208 bytes
SHA-256: e4552d9337544b12067204d6a1dde9a6b26fc501a1c26c9e2c7b351f3f74acf3
font_02_sfnt_off0001288d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1288D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1