Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5b686e37a96950…

MALICIOUS

PDF

94.5 KB Created: 2021-07-21 07:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 70d60c47f568a3cf90cd38764843f00d SHA-1: 5d6c86dc80bf41e165719a4b00b684969c86dea0 SHA-256: 3f5b686e37a969502ba39caaea1a88a1da30b0b97073fd73aeb14b0892c053a5
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. It functions as a link farm, directing users to multiple external domains, many of which are hosted on compromised CMS platforms. The presence of numerous PDF link farm heuristics suggests an attempt to obscure the final destination or to leverage SEO tactics for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://baglab.pl/galeria/file/lupufebuxogif.pdf In PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/f673dae42060768f9ada58b59b11bfeb/68659200304.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/ee8291a8cdfdf82fa344eabf7ca7b210/rubobivedokogubimela.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/bimifumufolapotose.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/tisfvda8sts277udiqriipiutg/wenabidawegob.pdfIn PDF document text
    • http://mobilesamara.com/img/files/file/zabowovo.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160755cf08f550---59116346414.pdfIn PDF document text
    • https://shibbirs.com/media/files/23587744019.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/2766989192.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/87300229104.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/bivima.pdfIn PDF document text
    • http://marcelponjee.nl/ponjeefiles/file/32203138838.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/16089c3f0e964a---tenunatu.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160effb3415e21---xiralumutumifof.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/vitikel.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f10a24cd---dofuvobixafazevapamen.pdfIn PDF document text
    • http://allycatering.com/userfiles/dukanugew.pdfIn PDF document text
    • http://akekaluck.com/ckfinder/userfiles/files/93531997101.pdfIn PDF document text
    • https://turkihale.com/userfiles/file/18835319568.pdfIn PDF document text
    • http://sparkpro.lv/content/file/53734285676.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/51988555292.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9bdf9e0f7---74633655621.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb15e2f4b4---44791053867.pdfIn PDF document text
    • http://dzbnf.com/upload/file///9841550632.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d53cb2779f---finesetukifomedotumuwa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=turkey+meat+and+goutPDF 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_off00010e30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012647.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12647 10552 bytes
SHA-256: 16b08107e61b2c963ad737460761ad2e0dfbe94ad468f023a8ef4eac44ffb948
font_02_sfnt_off00013e28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E28 17168 bytes
SHA-256: 25d16fb0b6faecff86dc1e8be877752acbe40de99b2713740302bcddab808d72