Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb07883a48f34be…

MALICIOUS

PDF

75.8 KB Created: 2021-09-03 22:02:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: b051365cccb275a398827b714e116c13 SHA-1: cdfe780afa7de1ba835d05fbf6e8a2df43bf84da SHA-256: fbb07883a48f34be5fc50a1f238515c27853cfb6c863dbe2f76c4ec14c1fff87
214 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to lure users to download malicious content. The heuristic firings indicate repeated payload links and a link farm strategy, consistent with phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Invisible/repeated PDF links deliver payload file critical PDF_REPEATED_PAYLOAD_LINK_LURE
    PDF uses invisible link annotations and points to a direct payload download. Repeated invisible links or lure-like payload names such as document/unlock/verify archives match malware-delivery PDF carriers where the page is only a prompt and the real payload is fetched from the linked URL.
  • 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.
  • 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://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/a98febb2545f1522d8c0495bce048a51/kovowuwefugevofeg.pdf In PDF document text
    • http://adabaskimerkezi.com/upload/file/39800467572.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/37399656544.pdfIn PDF document text
    • http://www.salpasafarit.fi/tiedostot/files/velusuvuni.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16119cf2a60e75---felisexabu.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/gonubofavabuxanitexu.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/funexakumopas.pdfIn PDF document text
    • http://isagenixmakessense.com/ckfinder/userfiles/files/12498484243.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610bbd95f349d---38015787634.pdfIn PDF document text
    • http://premium-h.info/files/files/ditimugeg.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d978b3b1da---fizegumijax.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/9754742449.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606da2041c55d---gokemevefolovifazigawizen.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/54104390619.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/b11dc9a8cba00267b4db3cbedccc0ee0/82052450604.pdfIn PDF document text
    • https://kanalprofi.at/UserFiles/file/jizadekesere.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5f86303da6---46876825322.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/98911284898.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bb1dd83e3e6---savosirugepifaro.pdfIn PDF document text
    • http://recko.ru/ckfinder/userfiles/files/23641097508.pdfIn PDF document text
    • https://megashina24.ru/files/files/lifisafilaruvelemus.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/zeboverasozafosabibo.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/80701917112.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=jpg+to+pdf+converter+cnetdownload.comIn 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.

FilenameKindSourceSize
font_00_sfnt_off0000c411.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC411 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dc28.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC28 10912 bytes
SHA-256: 6909370a3f0731e878b2c867d5f0c7679fafa66ab801f92e8215535ceb966a07
font_02_sfnt_off0000f54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54E 17180 bytes
SHA-256: 3a453304ebf73d6bd77337b410777ef934cc9f79984f5c949c5e779ee548e150

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